hide processing params for passthrough

* make epub and epub options public

* export only interface

README.md

@@ -89,6 +89,8 @@ The extensions can be: `jpg`, `jpeg`, `png`, `webp`, `tiff`.
 
 The case for extensions doesn't matter.
 
+For the passthrough mode (format=copy), the supported extensions are: `jpg`, `jpeg`, `png`
+
 # Usage
 
 ## Convert directory
@@ -443,34 +445,34 @@ Output:
 Config:
   -profile string (default "SR")
     	Profile to use: 
-    	    - HR      ( 2400x3840 ) - High Resolution
-    	    - SR      ( 1200x1920 ) - Standard Resolution
-    	    - K1      (   600x670 ) - Kindle 1
-    	    - K11     ( 1072x1448 ) - Kindle 11
-    	    - K2      (   600x670 ) - Kindle 2
-    	    - K34     (   600x800 ) - Kindle Keyboard/Touch
-    	    - K578    (   600x800 ) - Kindle
-    	    - KDX     (  824x1000 ) - Kindle DX/DXG
-    	    - KPW     (  758x1024 ) - Kindle Paperwhite 1/2
-    	    - KV      ( 1072x1448 ) - Kindle Paperwhite 3/4/Voyage/Oasis
-    	    - KPW5    ( 1236x1648 ) - Kindle Paperwhite 5/Signature Edition
-    	    - KO      ( 1264x1680 ) - Kindle Oasis 2/3
-    	    - KS      ( 1860x2480 ) - Kindle Scribe
-    	    - KoMT    (   600x800 ) - Kobo Mini/Touch
-    	    - KoG     (  768x1024 ) - Kobo Glo
-    	    - KoGHD   ( 1072x1448 ) - Kobo Glo HD
-    	    - KoA     (  758x1024 ) - Kobo Aura
-    	    - KoAHD   ( 1080x1440 ) - Kobo Aura HD
-    	    - KoAH2O  ( 1080x1430 ) - Kobo Aura H2O
-    	    - KoAO    ( 1404x1872 ) - Kobo Aura ONE
-    	    - KoN     (  758x1024 ) - Kobo Nia
-    	    - KoC     ( 1072x1448 ) - Kobo Clara HD/Kobo Clara 2E
-    	    - KoL     ( 1264x1680 ) - Kobo Libra H2O/Kobo Libra 2
-    	    - KoF     ( 1440x1920 ) - Kobo Forma
-    	    - KoS     ( 1440x1920 ) - Kobo Sage
-    	    - KoE     ( 1404x1872 ) - Kobo Elipsa
-    	    - RM1     ( 1404x1872 ) - reMarkable 1
-    	    - RM2     ( 1404x1872 ) - reMarkable 2
+    	    - KoAO    - 1404 x 1872 - Kobo Aura ONE
+    	    - KoF     - 1440 x 1920 - Kobo Forma
+    	    - KoE     - 1404 x 1872 - Kobo Elipsa
+    	    - KV      - 1072 x 1448 - Kindle Paperwhite 3/4/Voyage/Oasis
+    	    - KoG     -  768 x 1024 - Kobo Glo
+    	    - KoA     -  758 x 1024 - Kobo Aura
+    	    - RM1     - 1404 x 1872 - reMarkable 1
+    	    - RM2     - 1404 x 1872 - reMarkable 2
+    	    - K1      -  600 x 670  - Kindle 1
+    	    - K11     - 1072 x 1448 - Kindle 11
+    	    - K2      -  600 x 670  - Kindle 2
+    	    - K34     -  600 x 800  - Kindle Keyboard/Touch
+    	    - KPW5    - 1236 x 1648 - Kindle Paperwhite 5/Signature Edition
+    	    - KoAH2O  - 1080 x 1430 - Kobo Aura H2O
+    	    - KoN     -  758 x 1024 - Kobo Nia
+    	    - KoL     - 1264 x 1680 - Kobo Libra H2O/Kobo Libra 2
+    	    - HR      - 2400 x 3840 - High Resolution
+    	    - KO      - 1264 x 1680 - Kindle Oasis 2/3
+    	    - KS      - 1860 x 2480 - Kindle Scribe
+    	    - KoMT    -  600 x 800  - Kobo Mini/Touch
+    	    - KoAHD   - 1080 x 1440 - Kobo Aura HD
+    	    - KoC     - 1072 x 1448 - Kobo Clara HD/Kobo Clara 2E
+    	    - KoS     - 1440 x 1920 - Kobo Sage
+    	    - SR      - 1200 x 1920 - Standard Resolution
+    	    - K578    -  600 x 800  - Kindle
+    	    - KDX     -  824 x 1000 - Kindle DX/DXG
+    	    - KPW     -  758 x 1024 - Kindle Paperwhite 1/2
+    	    - KoGHD   - 1072 x 1448 - Kobo Glo HD
   -quality int (default 85)
     	Quality of the image
   -grayscale (default true)
@@ -527,10 +529,10 @@ Config:
     	Foreground color in hexadecimal format RGB. Black=000, White=FFF
   -background-color string (default "FFF")
     	Background color in hexadecimal format RGB. Black=000, White=FFF, Light Gray=DDD, Dark Gray=777
-  -noresize
-    	Do not reduce image size if exceed device size
+  -resize (default true)
+    	Reduce image size if exceed device size
   -format string (default "jpeg")
-    	Format of output images: jpeg (lossy), png (lossless)
+    	Format of output images: jpeg (lossy), png (lossless), copy (no processing)
   -aspect-ratio float
     	Aspect ratio (height/width) of the output
     	 -1 = same as device

go.mod

@@ -3,16 +3,16 @@ module github.com/celogeek/go-comic-converter/v3
 go 1.23
 
 require (
-	github.com/beevik/etree v1.4.1
+	github.com/beevik/etree v1.5.0
 	github.com/disintegration/gift v1.2.1
 	github.com/fogleman/gg v1.3.0
 	github.com/gofrs/uuid v4.4.0+incompatible
 	github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0
-	github.com/nwaples/rardecode/v2 v2.0.1
+	github.com/nwaples/rardecode/v2 v2.1.0
 	github.com/raff/pdfreader v0.0.0-20220308062436-033e8ac577f0
-	github.com/schollz/progressbar/v3 v3.17.1
+	github.com/schollz/progressbar/v3 v3.18.0
 	github.com/tcnksm/go-latest v0.0.0-20170313132115-e3007ae9052e
-	golang.org/x/image v0.23.0
+	golang.org/x/image v0.24.0
 	gopkg.in/yaml.v3 v3.0.1
 )
 
@@ -22,7 +22,7 @@ require (
 	github.com/hashicorp/go-version v1.7.0 // indirect
 	github.com/mitchellh/colorstring v0.0.0-20190213212951-d06e56a500db // indirect
 	github.com/rivo/uniseg v0.4.7 // indirect
-	golang.org/x/net v0.33.0 // indirect
-	golang.org/x/sys v0.28.0 // indirect
-	golang.org/x/term v0.27.0 // indirect
+	golang.org/x/net v0.35.0 // indirect
+	golang.org/x/sys v0.30.0 // indirect
+	golang.org/x/term v0.29.0 // indirect
 )

go.sum

@@ -1,5 +1,5 @@
-github.com/beevik/etree v1.4.1 h1:PmQJDDYahBGNKDcpdX8uPy1xRCwoCGVUiW669MEirVI=
-github.com/beevik/etree v1.4.1/go.mod h1:gPNJNaBGVZ9AwsidazFZyygnd+0pAU38N4D+WemwKNs=
+github.com/beevik/etree v1.5.0 h1:iaQZFSDS+3kYZiGoc9uKeOkUY3nYMXOKLl6KIJxiJWs=
+github.com/beevik/etree v1.5.0/go.mod h1:gPNJNaBGVZ9AwsidazFZyygnd+0pAU38N4D+WemwKNs=
 github.com/chengxilo/virtualterm v1.0.4 h1:Z6IpERbRVlfB8WkOmtbHiDbBANU7cimRIof7mk9/PwM=
 github.com/chengxilo/virtualterm v1.0.4/go.mod h1:DyxxBZz/x1iqJjFxTFcr6/x+jSpqN0iwWCOK1q10rlY=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
@@ -24,28 +24,28 @@ github.com/mattn/go-runewidth v0.0.16 h1:E5ScNMtiwvlvB5paMFdw9p4kSQzbXFikJ5SQO6T
 github.com/mattn/go-runewidth v0.0.16/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
 github.com/mitchellh/colorstring v0.0.0-20190213212951-d06e56a500db h1:62I3jR2EmQ4l5rM/4FEfDWcRD+abF5XlKShorW5LRoQ=
 github.com/mitchellh/colorstring v0.0.0-20190213212951-d06e56a500db/go.mod h1:l0dey0ia/Uv7NcFFVbCLtqEBQbrT4OCwCSKTEv6enCw=
-github.com/nwaples/rardecode/v2 v2.0.1 h1:3MN6/R+Y4c7e+21U3yhWuUcf72sYmcmr6jtiuAVSH1A=
-github.com/nwaples/rardecode/v2 v2.0.1/go.mod h1:yntwv/HfMc/Hbvtq9I19D1n58te3h6KsqCf3GxyfBGY=
+github.com/nwaples/rardecode/v2 v2.1.0 h1:JQl9ZoBPDy+nIZGb1mx8+anfHp/LV3NE2MjMiv0ct/U=
+github.com/nwaples/rardecode/v2 v2.1.0/go.mod h1:7uz379lSxPe6j9nvzxUZ+n7mnJNgjsRNb6IbvGVHRmw=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/raff/pdfreader v0.0.0-20220308062436-033e8ac577f0 h1:fuFvfwIc+cpySYurvDNTs5LIHXP9Cj3reVRplj9Whv4=
 github.com/raff/pdfreader v0.0.0-20220308062436-033e8ac577f0/go.mod h1:Ql3QqeGiYGlPOtYz+F/L7J27spqDcdH9LhDHOrrdsD4=
 github.com/rivo/uniseg v0.4.7 h1:WUdvkW8uEhrYfLC4ZzdpI2ztxP1I582+49Oc5Mq64VQ=
 github.com/rivo/uniseg v0.4.7/go.mod h1:FN3SvrM+Zdj16jyLfmOkMNblXMcoc8DfTHruCPUcx88=
-github.com/schollz/progressbar/v3 v3.17.1 h1:bI1MTaoQO+v5kzklBjYNRQLoVpe0zbyRZNK6DFkVC5U=
-github.com/schollz/progressbar/v3 v3.17.1/go.mod h1:RzqpnsPQNjUyIgdglUjRLgD7sVnxN1wpmBMV+UiEbL4=
+github.com/schollz/progressbar/v3 v3.18.0 h1:uXdoHABRFmNIjUfte/Ex7WtuyVslrw2wVPQmCN62HpA=
+github.com/schollz/progressbar/v3 v3.18.0/go.mod h1:IsO3lpbaGuzh8zIMzgY3+J8l4C8GjO0Y9S69eFvNsec=
 github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
 github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
 github.com/tcnksm/go-latest v0.0.0-20170313132115-e3007ae9052e h1:IWllFTiDjjLIf2oeKxpIUmtiDV5sn71VgeQgg6vcE7k=
 github.com/tcnksm/go-latest v0.0.0-20170313132115-e3007ae9052e/go.mod h1:d7u6HkTYKSv5m6MCKkOQlHwaShTMl3HjqSGW3XtVhXM=
-golang.org/x/image v0.23.0 h1:HseQ7c2OpPKTPVzNjG5fwJsOTCiiwS4QdsYi5XU6H68=
-golang.org/x/image v0.23.0/go.mod h1:wJJBTdLfCCf3tiHa1fNxpZmUI4mmoZvwMCPP0ddoNKY=
-golang.org/x/net v0.33.0 h1:74SYHlV8BIgHIFC/LrYkOGIwL19eTYXQ5wc6TBuO36I=
-golang.org/x/net v0.33.0/go.mod h1:HXLR5J+9DxmrqMwG9qjGCxZ+zKXxBru04zlTvWlWuN4=
-golang.org/x/sys v0.28.0 h1:Fksou7UEQUWlKvIdsqzJmUmCX3cZuD2+P3XyyzwMhlA=
-golang.org/x/sys v0.28.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
-golang.org/x/term v0.27.0 h1:WP60Sv1nlK1T6SupCHbXzSaN0b9wUmsPoRS9b61A23Q=
-golang.org/x/term v0.27.0/go.mod h1:iMsnZpn0cago0GOrHO2+Y7u7JPn5AylBrcoWkElMTSM=
+golang.org/x/image v0.24.0 h1:AN7zRgVsbvmTfNyqIbbOraYL8mSwcKncEj8ofjgzcMQ=
+golang.org/x/image v0.24.0/go.mod h1:4b/ITuLfqYq1hqZcjofwctIhi7sZh2WaCjvsBNjjya8=
+golang.org/x/net v0.35.0 h1:T5GQRQb2y08kTAByq9L4/bz8cipCdA8FbRTXewonqY8=
+golang.org/x/net v0.35.0/go.mod h1:EglIi67kWsHKlRzzVMUD93VMSWGFOMSZgxFjparz1Qk=
+golang.org/x/sys v0.30.0 h1:QjkSwP/36a20jFYWkSue1YwXzLmsV5Gfq7Eiy72C1uc=
+golang.org/x/sys v0.30.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/term v0.29.0 h1:L6pJp37ocefwRRtYPKSWOWzOtWSxVajvz2ldH/xi3iU=
+golang.org/x/term v0.29.0/go.mod h1:6bl4lRlvVuDgSf3179VpIxBF0o10JUpXWOnI7nErv7s=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=

internal/pkg/converter/converter.go

@@ -15,6 +15,7 @@ import (
 	"reflect"
 	"regexp"
 	"runtime"
+	"slices"
 	"strings"
 	"time"
 
@@ -131,7 +132,7 @@ func (c *Converter) InitParse() {
 	c.AddStringParam(&c.Options.Image.View.Color.Foreground, "foreground-color", c.Options.Image.View.Color.Foreground, "Foreground color in hexadecimal format RGB. Black=000, White=FFF")
 	c.AddStringParam(&c.Options.Image.View.Color.Background, "background-color", c.Options.Image.View.Color.Background, "Background color in hexadecimal format RGB. Black=000, White=FFF, Light Gray=DDD, Dark Gray=777")
 	c.AddBoolParam(&c.Options.Image.Resize, "resize", c.Options.Image.Resize, "Reduce image size if exceed device size")
-	c.AddStringParam(&c.Options.Image.Format, "format", c.Options.Image.Format, "Format of output images: jpeg (lossy), png (lossless)")
+	c.AddStringParam(&c.Options.Image.Format, "format", c.Options.Image.Format, "Format of output images: jpeg (lossy), png (lossless), copy (no processing)")
 	c.AddFloatParam(&c.Options.Image.View.AspectRatio, "aspect-ratio", c.Options.Image.View.AspectRatio, "Aspect ratio (height/width) of the output\n -1 = same as device\n  0 = same as source\n1.6 = amazon advice for kindle")
 	c.AddBoolParam(&c.Options.Image.View.PortraitOnly, "portrait-only", c.Options.Image.View.PortraitOnly, "Portrait only: force orientation to portrait only.")
 	c.AddIntParam(&c.Options.TitlePage, "titlepage", c.Options.TitlePage, "Title page\n0 = never\n1 = always\n2 = only if epub is split")
@@ -379,8 +380,8 @@ func (c *Converter) Validate() error {
 	}
 
 	// Format
-	if !(c.Options.Image.Format == "jpeg" || c.Options.Image.Format == "png") {
-		return errors.New("format should be jpeg or png")
+	if !slices.Contains([]string{"jpeg", "png", "copy"}, c.Options.Image.Format) {
+		return errors.New("format should be jpeg, png or copy")
 	}
 
 	// Aspect Ratio

internal/pkg/converter/options.go

@@ -9,8 +9,8 @@ import (
 
 	"gopkg.in/yaml.v3"
 
-	"github.com/celogeek/go-comic-converter/v3/internal/pkg/epuboptions"
 	"github.com/celogeek/go-comic-converter/v3/internal/pkg/utils"
+	"github.com/celogeek/go-comic-converter/v3/pkg/epuboptions"
 )
 
 type Options struct {
@@ -178,9 +178,9 @@ func (o *Options) ShowConfig() string {
 		{"Profile", profileDesc, true},
 		{"Format", o.Image.Format, true},
 		{"Quality", o.Image.Quality, o.Image.Format == "jpeg"},
-		{"Grayscale", o.Image.GrayScale, true},
-		{"Grayscale mode", grayscaleMode, o.Image.GrayScale},
-		{"Crop", o.Image.Crop.Enabled, true},
+		{"Grayscale", o.Image.GrayScale, o.Image.Format != "copy"},
+		{"Grayscale mode", grayscaleMode, o.Image.Format != "copy" && o.Image.GrayScale},
+		{"Crop", o.Image.Crop.Enabled, o.Image.Format != "copy"},
 		{"Crop ratio",
 			utils.IntToString(o.Image.Crop.Left) + " Left - " +
 				utils.IntToString(o.Image.Crop.Up) + " Up - " +
@@ -188,15 +188,15 @@ func (o *Options) ShowConfig() string {
 				utils.IntToString(o.Image.Crop.Bottom) + " Bottom - " +
 				"Limit " + utils.IntToString(o.Image.Crop.Limit) + "% - " +
 				"Skip " + utils.BoolToString(o.Image.Crop.SkipIfLimitReached),
-			o.Image.Crop.Enabled},
-		{"Brightness", o.Image.Brightness, o.Image.Brightness != 0},
-		{"Contrast", o.Image.Contrast, o.Image.Contrast != 0},
-		{"Auto contrast", o.Image.AutoContrast, true},
-		{"Auto rotate", o.Image.AutoRotate, true},
-		{"Auto split double page", o.Image.AutoSplitDoublePage, o.Image.View.PortraitOnly || !o.Image.AppleBookCompatibility},
-		{"Keep double page if split", o.Image.KeepDoublePageIfSplit, (o.Image.View.PortraitOnly || !o.Image.AppleBookCompatibility) && o.Image.AutoSplitDoublePage},
-		{"Keep split double page aspect", o.Image.KeepSplitDoublePageAspect, (o.Image.View.PortraitOnly || !o.Image.AppleBookCompatibility) && o.Image.AutoSplitDoublePage},
-		{"No blank image", o.Image.NoBlankImage, true},
+			o.Image.Format != "copy" && o.Image.Crop.Enabled},
+		{"Brightness", o.Image.Brightness, o.Image.Format != "copy" && o.Image.Brightness != 0},
+		{"Contrast", o.Image.Contrast, o.Image.Format != "copy" && o.Image.Contrast != 0},
+		{"Auto contrast", o.Image.AutoContrast, o.Image.Format != "copy"},
+		{"Auto rotate", o.Image.AutoRotate, o.Image.Format != "copy"},
+		{"Auto split double page", o.Image.AutoSplitDoublePage, o.Image.Format != "copy" && (o.Image.View.PortraitOnly || !o.Image.AppleBookCompatibility)},
+		{"Keep double page if split", o.Image.KeepDoublePageIfSplit, o.Image.Format != "copy" && (o.Image.View.PortraitOnly || !o.Image.AppleBookCompatibility) && o.Image.AutoSplitDoublePage},
+		{"Keep split double page aspect", o.Image.KeepSplitDoublePageAspect, o.Image.Format != "copy" && (o.Image.View.PortraitOnly || !o.Image.AppleBookCompatibility) && o.Image.AutoSplitDoublePage},
+		{"No blank image", o.Image.NoBlankImage, o.Image.Format != "copy"},
 		{"Manga", o.Image.Manga, true},
 		{"Has cover", o.Image.HasCover, true},
 		{"Limit", utils.IntToString(o.LimitMb) + " Mb", o.LimitMb != 0},
@@ -204,7 +204,7 @@ func (o *Options) ShowConfig() string {
 		{"Sort path mode", sortpathmode, true},
 		{"Foreground color", "#" + o.Image.View.Color.Foreground, true},
 		{"Background color", "#" + o.Image.View.Color.Background, true},
-		{"Resize", o.Image.Resize, true},
+		{"Resize", o.Image.Resize, o.Image.Format != "copy"},
 		{"Aspect ratio", aspectRatio, true},
 		{"Portrait only", o.Image.View.PortraitOnly, true},
 		{"Title page", titlePage, true},

internal/pkg/epubimage/epub_image.go

@@ -73,6 +73,11 @@ func (i EPUBImage) EPUBImgPath() string {
 	return "OEBPS/" + i.ImgPath()
 }
 
+// MediaType of the epub image
+func (i EPUBImage) MediaType() string {
+	return "image/" + i.Format
+}
+
 // ImgStyle style to apply to the image.
 //
 // center by default.

internal/pkg/epubimagepassthrough/passthrough.go

@@ -0,0 +1,432 @@
+package epubimagepassthrough
+
+import (
+	"archive/zip"
+	"bytes"
+	"errors"
+	"fmt"
+	"image"
+	"image/jpeg"
+	"image/png"
+	"io"
+	"io/fs"
+	"os"
+	"path/filepath"
+	"sort"
+	"strings"
+
+	"github.com/nwaples/rardecode/v2"
+
+	"github.com/celogeek/go-comic-converter/v3/internal/pkg/epubimage"
+	"github.com/celogeek/go-comic-converter/v3/internal/pkg/epubimageprocessor"
+	"github.com/celogeek/go-comic-converter/v3/internal/pkg/epubprogress"
+	"github.com/celogeek/go-comic-converter/v3/internal/pkg/epubzip"
+	"github.com/celogeek/go-comic-converter/v3/internal/pkg/sortpath"
+	"github.com/celogeek/go-comic-converter/v3/pkg/epuboptions"
+)
+
+type ePUBImagePassthrough struct {
+	epuboptions.EPUBOptions
+}
+
+func (e ePUBImagePassthrough) Load() (images []epubimage.EPUBImage, err error) {
+	fi, err := os.Stat(e.Input)
+	if err != nil {
+		return
+	}
+
+	if fi.IsDir() {
+		return e.loadDir()
+	} else {
+		switch ext := strings.ToLower(filepath.Ext(e.Input)); ext {
+		case ".cbz", ".zip":
+			return e.loadCbz()
+		case ".cbr", ".rar":
+			return e.loadCbr()
+		default:
+			return nil, fmt.Errorf("unknown file format (%s): support .cbz, .zip, .cbr, .rar", ext)
+		}
+	}
+}
+
+func (e ePUBImagePassthrough) CoverTitleData(o epubimageprocessor.CoverTitleDataOptions) (epubzip.Image, error) {
+	return epubimageprocessor.New(e.EPUBOptions).CoverTitleData(o)
+}
+
+var errNoImagesFound = errors.New("no images found")
+
+func New(o epuboptions.EPUBOptions) epubimageprocessor.EPUBImageProcessor {
+	return ePUBImagePassthrough{o}
+}
+
+func (e ePUBImagePassthrough) loadDir() (images []epubimage.EPUBImage, err error) {
+	imagesPath := make([]string, 0)
+
+	input := filepath.Clean(e.Input)
+	err = filepath.WalkDir(input, func(path string, d fs.DirEntry, err error) error {
+		if err != nil {
+			return err
+		}
+
+		if !d.IsDir() && e.isSupportedImage(path) {
+			imagesPath = append(imagesPath, path)
+		}
+
+		return nil
+	})
+
+	if err != nil {
+		return
+	}
+
+	if len(imagesPath) == 0 {
+		err = errNoImagesFound
+		return
+	}
+
+	sort.Sort(sortpath.By(imagesPath, e.SortPathMode))
+
+	var imgStorage epubzip.StorageImageWriter
+	imgStorage, err = epubzip.NewStorageImageWriter(e.ImgStorage(), e.Image.Format)
+	if err != nil {
+		return
+	}
+	defer imgStorage.Close()
+
+	// processing
+	bar := epubprogress.New(epubprogress.Options{
+		Quiet:       e.Quiet,
+		Json:        e.Json,
+		Max:         len(imagesPath),
+		Description: "Copying",
+		CurrentJob:  1,
+		TotalJob:    2,
+	})
+	defer bar.Close()
+
+	for i, imgPath := range imagesPath {
+
+		var img epubimage.EPUBImage
+		img, err = e.copyRawDataToStorage(
+			imgStorage,
+			func() ([]byte, error) {
+				f, err := os.Open(imgPath)
+				if err != nil {
+					return nil, err
+				}
+				defer f.Close()
+				return io.ReadAll(f)
+			},
+			i,
+			input,
+			imgPath,
+		)
+		if err != nil {
+			return
+		}
+
+		images = append(images, img)
+		_ = bar.Add(1)
+	}
+
+	if len(images) == 0 {
+		err = errNoImagesFound
+	}
+
+	return
+
+}
+
+func (e ePUBImagePassthrough) loadCbz() (images []epubimage.EPUBImage, err error) {
+	images = make([]epubimage.EPUBImage, 0)
+
+	input := filepath.Clean(e.Input)
+	r, err := zip.OpenReader(input)
+	if err != nil {
+		return
+	}
+	defer r.Close()
+
+	imagesZip := make([]*zip.File, 0)
+	for _, f := range r.File {
+		if !f.FileInfo().IsDir() && e.isSupportedImage(f.Name) {
+			imagesZip = append(imagesZip, f)
+		}
+	}
+
+	if len(imagesZip) == 0 {
+		err = errNoImagesFound
+		return
+	}
+
+	var names []string
+	for _, img := range imagesZip {
+		names = append(names, img.Name)
+	}
+
+	sort.Sort(sortpath.By(names, e.SortPathMode))
+
+	indexedNames := make(map[string]int)
+	for i, name := range names {
+		indexedNames[name] = i
+	}
+
+	var imgStorage epubzip.StorageImageWriter
+	imgStorage, err = epubzip.NewStorageImageWriter(e.ImgStorage(), e.Image.Format)
+	if err != nil {
+		return
+	}
+	defer imgStorage.Close()
+
+	// processing
+	bar := epubprogress.New(epubprogress.Options{
+		Quiet:       e.Quiet,
+		Json:        e.Json,
+		Max:         len(imagesZip),
+		Description: "Copying",
+		CurrentJob:  1,
+		TotalJob:    2,
+	})
+	defer bar.Close()
+
+	for _, imgZip := range imagesZip {
+		if _, ok := indexedNames[imgZip.Name]; !ok {
+			continue
+		}
+
+		var img epubimage.EPUBImage
+		img, err = e.copyRawDataToStorage(
+			imgStorage,
+			func() ([]byte, error) {
+				f, err := imgZip.Open()
+				if err != nil {
+					return nil, err
+				}
+				defer f.Close()
+
+				return io.ReadAll(f)
+			},
+			indexedNames[imgZip.Name],
+			"",
+			imgZip.Name,
+		)
+
+		if err != nil {
+			return
+		}
+
+		images = append(images, img)
+		_ = bar.Add(1)
+	}
+
+	if len(images) == 0 {
+		err = errNoImagesFound
+	}
+
+	return
+}
+
+func (e ePUBImagePassthrough) loadCbr() (images []epubimage.EPUBImage, err error) {
+	images = make([]epubimage.EPUBImage, 0)
+
+	var isSolid bool
+	files, err := rardecode.List(e.Input)
+	if err != nil {
+		return
+	}
+
+	names := make([]string, 0)
+	for _, f := range files {
+		if !f.IsDir && e.isSupportedImage(f.Name) {
+			if f.Solid {
+				isSolid = true
+			}
+			names = append(names, f.Name)
+		}
+	}
+
+	if len(names) == 0 {
+		err = errNoImagesFound
+		return
+	}
+
+	sort.Sort(sortpath.By(names, e.SortPathMode))
+
+	indexedNames := make(map[string]int)
+	for i, name := range names {
+		indexedNames[name] = i
+	}
+
+	var imgStorage epubzip.StorageImageWriter
+	imgStorage, err = epubzip.NewStorageImageWriter(e.ImgStorage(), e.Image.Format)
+	if err != nil {
+		return
+	}
+	defer imgStorage.Close()
+
+	// processing
+	bar := epubprogress.New(epubprogress.Options{
+		Quiet:       e.Quiet,
+		Json:        e.Json,
+		Max:         len(names),
+		Description: "Copying",
+		CurrentJob:  1,
+		TotalJob:    2,
+	})
+	defer bar.Close()
+
+	if isSolid {
+		var r *rardecode.ReadCloser
+		r, err = rardecode.OpenReader(e.Input)
+		if err != nil {
+			return
+		}
+		defer r.Close()
+
+		for {
+			f, rerr := r.Next()
+			if rerr != nil {
+				if rerr == io.EOF {
+					break
+				}
+				err = rerr
+				return
+			}
+
+			if _, ok := indexedNames[f.Name]; !ok {
+				continue
+			}
+
+			var img epubimage.EPUBImage
+			img, err = e.copyRawDataToStorage(
+				imgStorage,
+				func() ([]byte, error) {
+					return io.ReadAll(r)
+				},
+				indexedNames[f.Name],
+				"",
+				f.Name,
+			)
+
+			if err != nil {
+				return
+			}
+
+			images = append(images, img)
+			_ = bar.Add(1)
+		}
+	} else {
+		for _, file := range files {
+			if i, ok := indexedNames[file.Name]; ok {
+				var img epubimage.EPUBImage
+				img, err = e.copyRawDataToStorage(
+					imgStorage,
+					func() ([]byte, error) {
+						f, err := file.Open()
+						if err != nil {
+							return nil, err
+						}
+						defer f.Close()
+						return io.ReadAll(f)
+					},
+					i,
+					"",
+					file.Name,
+				)
+
+				if err != nil {
+					return
+				}
+
+				images = append(images, img)
+				_ = bar.Add(1)
+			}
+		}
+	}
+
+	if len(images) == 0 {
+		err = errNoImagesFound
+	}
+
+	return
+}
+
+func (e ePUBImagePassthrough) isSupportedImage(path string) bool {
+	switch strings.ToLower(filepath.Ext(path)) {
+	case ".jpg", ".jpeg", ".png":
+		{
+			return !strings.HasPrefix(filepath.Base(path), ".")
+		}
+	}
+	return false
+}
+
+func (e ePUBImagePassthrough) copyRawDataToStorage(
+	imgStorage epubzip.StorageImageWriter,
+	getData func() ([]byte, error),
+	id int,
+	dirname string,
+	filename string,
+) (img epubimage.EPUBImage, err error) {
+	var uncompressedData []byte
+	uncompressedData, err = getData()
+	if err != nil {
+		return
+	}
+
+	p, fn := filepath.Split(filepath.Clean(filename))
+	if p == dirname {
+		p = ""
+	} else {
+		p = p[len(dirname)+1:]
+	}
+
+	var (
+		format       string
+		decodeConfig func(r io.Reader) (image.Config, error)
+		decode       func(r io.Reader) (image.Image, error)
+	)
+
+	switch filepath.Ext(fn) {
+	case ".png":
+		format = "png"
+		decodeConfig = png.DecodeConfig
+		decode = png.Decode
+	case ".jpg", ".jpeg":
+		format = "jpeg"
+		decodeConfig = jpeg.DecodeConfig
+		decode = jpeg.Decode
+	}
+
+	var config image.Config
+	config, err = decodeConfig(bytes.NewReader(uncompressedData))
+	if err != nil {
+		return
+	}
+
+	var rawImage image.Image
+	if id == 0 {
+		rawImage, err = decode(bytes.NewReader(uncompressedData))
+		if err != nil {
+			return
+		}
+	}
+
+	img = epubimage.EPUBImage{
+		Id:                  id,
+		Part:                0,
+		Raw:                 rawImage,
+		Width:               config.Width,
+		Height:              config.Height,
+		IsBlank:             false,
+		DoublePage:          config.Width > config.Height,
+		Path:                p,
+		Name:                fn,
+		Format:              format,
+		OriginalAspectRatio: float64(config.Height) / float64(config.Width),
+	}
+
+	err = imgStorage.AddRaw(img.EPUBImgPath(), uncompressedData)
+
+	return
+}

internal/pkg/epubimageprocessor/loader.go

@@ -43,18 +43,18 @@ type task struct {
 var errNoImagesFound = errors.New("no images found")
 
 // only accept jpg, png and webp as source file
-func (e EPUBImageProcessor) isSupportedImage(path string) bool {
+func (e ePUBImageProcessor) isSupportedImage(path string) bool {
 	switch strings.ToLower(filepath.Ext(path)) {
 	case ".jpg", ".jpeg", ".png", ".webp", ".tiff":
 		{
-			return true
+			return !strings.HasPrefix(filepath.Base(path), ".")
 		}
 	}
 	return false
 }
 
-// Load images from input
-func (e EPUBImageProcessor) load() (totalImages int, output chan task, err error) {
+// load images from input
+func (e ePUBImageProcessor) load() (totalImages int, output chan task, err error) {
 	fi, err := os.Stat(e.Input)
 	if err != nil {
 		return
@@ -78,7 +78,7 @@ func (e EPUBImageProcessor) load() (totalImages int, output chan task, err error
 	}
 }
 
-func (e EPUBImageProcessor) corruptedImage(path, name string) image.Image {
+func (e ePUBImageProcessor) corruptedImage(path, name string) image.Image {
 	var w, h float64 = 1200, 1920
 	f, _ := truetype.Parse(gomonobold.TTF)
 	face := truetype.NewFace(f, &truetype.Options{Size: 64, DPI: 72})
@@ -102,7 +102,7 @@ func (e EPUBImageProcessor) corruptedImage(path, name string) image.Image {
 }
 
 // load a directory of images
-func (e EPUBImageProcessor) loadDir() (totalImages int, output chan task, err error) {
+func (e ePUBImageProcessor) loadDir() (totalImages int, output chan task, err error) {
 	images := make([]string, 0)
 
 	input := filepath.Clean(e.Input)
@@ -191,7 +191,7 @@ func (e EPUBImageProcessor) loadDir() (totalImages int, output chan task, err er
 }
 
 // load a zip file that include images
-func (e EPUBImageProcessor) loadCbz() (totalImages int, output chan task, err error) {
+func (e ePUBImageProcessor) loadCbz() (totalImages int, output chan task, err error) {
 	r, err := zip.OpenReader(e.Input)
 	if err != nil {
 		return
@@ -277,7 +277,7 @@ func (e EPUBImageProcessor) loadCbz() (totalImages int, output chan task, err er
 }
 
 // load a rar file that include images
-func (e EPUBImageProcessor) loadCbr() (totalImages int, output chan task, err error) {
+func (e ePUBImageProcessor) loadCbr() (totalImages int, output chan task, err error) {
 	var isSolid bool
 	files, err := rardecode.List(e.Input)
 	if err != nil {
@@ -393,7 +393,7 @@ func (e EPUBImageProcessor) loadCbr() (totalImages int, output chan task, err er
 }
 
 // extract image from a pdf
-func (e EPUBImageProcessor) loadPdf() (totalImages int, output chan task, err error) {
+func (e ePUBImageProcessor) loadPdf() (totalImages int, output chan task, err error) {
 	pdf := pdfread.Load(e.Input)
 	if pdf == nil {
 		err = fmt.Errorf("can't read pdf")

internal/pkg/epubimageprocessor/processor.go

@@ -11,22 +11,27 @@ import (
 
 	"github.com/celogeek/go-comic-converter/v3/internal/pkg/epubimage"
 	"github.com/celogeek/go-comic-converter/v3/internal/pkg/epubimagefilters"
-	"github.com/celogeek/go-comic-converter/v3/internal/pkg/epuboptions"
 	"github.com/celogeek/go-comic-converter/v3/internal/pkg/epubprogress"
 	"github.com/celogeek/go-comic-converter/v3/internal/pkg/epubzip"
 	"github.com/celogeek/go-comic-converter/v3/internal/pkg/utils"
+	"github.com/celogeek/go-comic-converter/v3/pkg/epuboptions"
 )
 
-type EPUBImageProcessor struct {
+type EPUBImageProcessor interface {
+	Load() (images []epubimage.EPUBImage, err error)
+	CoverTitleData(o CoverTitleDataOptions) (epubzip.Image, error)
+}
+
+type ePUBImageProcessor struct {
 	epuboptions.EPUBOptions
 }
 
 func New(o epuboptions.EPUBOptions) EPUBImageProcessor {
-	return EPUBImageProcessor{o}
+	return ePUBImageProcessor{o}
 }
 
 // Load extract and convert images
-func (e EPUBImageProcessor) Load() (images []epubimage.EPUBImage, err error) {
+func (e ePUBImageProcessor) Load() (images []epubimage.EPUBImage, err error) {
 	images = make([]epubimage.EPUBImage, 0)
 	imageCount, imageInput, err := e.load()
 	if err != nil {
@@ -136,7 +141,7 @@ func (e EPUBImageProcessor) Load() (images []epubimage.EPUBImage, err error) {
 	return images, nil
 }
 
-func (e EPUBImageProcessor) createImage(src image.Image, r image.Rectangle) draw.Image {
+func (e ePUBImageProcessor) createImage(src image.Image, r image.Rectangle) draw.Image {
 	if e.EPUBOptions.Image.GrayScale {
 		return image.NewGray(r)
 	}
@@ -169,7 +174,7 @@ func (e EPUBImageProcessor) createImage(src image.Image, r image.Rectangle) draw
 
 // transform image into 1 or 3 images
 // only doublepage with autosplit has 3 versions
-func (e EPUBImageProcessor) transformImage(input task, part int, right bool) epubimage.EPUBImage {
+func (e ePUBImageProcessor) transformImage(input task, part int, right bool) epubimage.EPUBImage {
 	g := gift.New()
 	src := input.Image
 	srcBounds := src.Bounds()
@@ -286,7 +291,7 @@ type CoverTitleDataOptions struct {
 	BorderSize  int
 }
 
-func (e EPUBImageProcessor) Cover16LevelOfGray(bounds image.Rectangle) draw.Image {
+func (e ePUBImageProcessor) cover16LevelOfGray(bounds image.Rectangle) draw.Image {
 	return image.NewPaletted(bounds, color.Palette{
 		color.Gray{},
 		color.Gray{Y: 0x11},
@@ -308,20 +313,20 @@ func (e EPUBImageProcessor) Cover16LevelOfGray(bounds image.Rectangle) draw.Imag
 }
 
 // CoverTitleData create a title page with the cover
-func (e EPUBImageProcessor) CoverTitleData(o CoverTitleDataOptions) (epubzip.Image, error) {
+func (e ePUBImageProcessor) CoverTitleData(o CoverTitleDataOptions) (epubzip.Image, error) {
 	// Create a blur version of the cover
 	g := gift.New(epubimagefilters.CoverTitle(o.Text, o.Align, o.PctWidth, o.PctMargin, o.MaxFontSize, o.BorderSize))
 	var dst draw.Image
 	if o.Name == "cover" && e.Image.GrayScale {
-		dst = e.Cover16LevelOfGray(o.Src.Bounds())
+		dst = e.cover16LevelOfGray(o.Src.Bounds())
 	} else {
 		dst = e.createImage(o.Src, g.Bounds(o.Src.Bounds()))
 	}
 	g.Draw(dst, o.Src)
 
 	return epubzip.CompressImage(
-		"OEBPS/Images/"+o.Name+"."+e.Image.Format,
-		e.Image.Format,
+		"OEBPS/Images/"+o.Name+".jpeg",
+		"jpeg",
 		dst,
 		e.Image.Quality,
 	)

internal/pkg/epubtemplates/content.go

@@ -4,8 +4,8 @@ import (
 	"github.com/beevik/etree"
 
 	"github.com/celogeek/go-comic-converter/v3/internal/pkg/epubimage"
-	"github.com/celogeek/go-comic-converter/v3/internal/pkg/epuboptions"
 	"github.com/celogeek/go-comic-converter/v3/internal/pkg/utils"
+	"github.com/celogeek/go-comic-converter/v3/pkg/epuboptions"
 )
 
 type Content struct {
@@ -144,7 +144,7 @@ func (o Content) getManifest() []tag {
 	var imageTags, pageTags, spaceTags []tag
 	addTag := func(img epubimage.EPUBImage, withSpace bool) {
 		imageTags = append(imageTags,
-			tag{"item", tagAttrs{"id": img.ImgKey(), "href": img.ImgPath(), "media-type": o.ImageOptions.MediaType()}, ""},
+			tag{"item", tagAttrs{"id": img.ImgKey(), "href": img.ImgPath(), "media-type": img.MediaType()}, ""},
 		)
 		pageTags = append(pageTags,
 			tag{"item", tagAttrs{"id": img.PageKey(), "href": img.PagePath(), "media-type": "application/xhtml+xml"}, ""},
@@ -160,13 +160,13 @@ func (o Content) getManifest() []tag {
 		{"item", tagAttrs{"id": "toc", "href": "toc.xhtml", "properties": "nav", "media-type": "application/xhtml+xml"}, ""},
 		{"item", tagAttrs{"id": "css", "href": "Text/style.css", "media-type": "text/css"}, ""},
 		{"item", tagAttrs{"id": "page_cover", "href": "Text/cover.xhtml", "media-type": "application/xhtml+xml"}, ""},
-		{"item", tagAttrs{"id": "img_cover", "href": "Images/cover." + o.ImageOptions.Format, "media-type": o.ImageOptions.MediaType()}, ""},
+		{"item", tagAttrs{"id": "img_cover", "href": "Images/cover.jpeg", "media-type": "image/jpeg"}, ""},
 	}
 
 	if o.HasTitlePage {
 		items = append(items,
 			tag{"item", tagAttrs{"id": "page_title", "href": "Text/title.xhtml", "media-type": "application/xhtml+xml"}, ""},
-			tag{"item", tagAttrs{"id": "img_title", "href": "Images/title." + o.ImageOptions.Format, "media-type": o.ImageOptions.MediaType()}, ""},
+			tag{"item", tagAttrs{"id": "img_title", "href": "Images/title.jpeg", "media-type": "image/jpeg"}, ""},
 		)
 
 		if !o.ImageOptions.View.PortraitOnly {

internal/pkg/epubtemplates/style.css.tmpl

@@ -15,4 +15,5 @@ img {
   margin:0;
   padding:0;
   z-index:0;
-}
+  object-fit: contain;
+}

internal/pkg/epubzip/image.go

@@ -66,3 +66,39 @@ func CompressImage(filename string, format string, img image.Image, quality int)
 		cdata.Bytes(),
 	}, nil
 }
+
+func CompressRaw(filename string, uncompressedData []byte) (Image, error) {
+	var (
+		cdata bytes.Buffer
+		err   error
+	)
+	wcdata, err := flate.NewWriter(&cdata, flate.BestCompression)
+	if err != nil {
+		return Image{}, err
+	}
+
+	_, err = wcdata.Write(uncompressedData)
+	if err != nil {
+		return Image{}, err
+	}
+
+	err = wcdata.Close()
+	if err != nil {
+		return Image{}, err
+	}
+
+	t := time.Now()
+	//goland:noinspection GoDeprecation
+	return Image{
+		&zip.FileHeader{
+			Name:               filename,
+			CompressedSize64:   uint64(cdata.Len()),
+			UncompressedSize64: uint64(len(uncompressedData)),
+			CRC32:              crc32.Checksum(uncompressedData, crc32.IEEETable),
+			Method:             zip.Deflate,
+			ModifiedTime:       uint16(t.Second()/2 + t.Minute()<<5 + t.Hour()<<11),
+			ModifiedDate:       uint16(t.Day() + int(t.Month())<<5 + (t.Year()-1980)<<9),
+		},
+		cdata.Bytes(),
+	}, nil
+}

internal/pkg/epubzip/storage_image_writer.go

@@ -50,3 +50,24 @@ func (e StorageImageWriter) Add(filename string, img image.Image, quality int) e
 
 	return nil
 }
+
+func (e StorageImageWriter) AddRaw(filename string, uncompressedData []byte) error {
+	zipImage, err := CompressRaw(filename, uncompressedData)
+
+	if err != nil {
+		return err
+	}
+
+	e.mut.Lock()
+	defer e.mut.Unlock()
+	fh, err := e.fz.CreateRaw(zipImage.Header)
+	if err != nil {
+		return err
+	}
+	_, err = fh.Write(zipImage.Data)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}

main.go

@@ -15,8 +15,8 @@ import (
 	"github.com/tcnksm/go-latest"
 
 	"github.com/celogeek/go-comic-converter/v3/internal/pkg/converter"
-	"github.com/celogeek/go-comic-converter/v3/internal/pkg/epub"
 	"github.com/celogeek/go-comic-converter/v3/internal/pkg/utils"
+	"github.com/celogeek/go-comic-converter/v3/pkg/epub"
 )
 
 func main() {

pkg/epub/epub.go

@@ -15,16 +15,21 @@ import (
 	"github.com/gofrs/uuid"
 
 	"github.com/celogeek/go-comic-converter/v3/internal/pkg/epubimage"
+	"github.com/celogeek/go-comic-converter/v3/internal/pkg/epubimagepassthrough"
 	"github.com/celogeek/go-comic-converter/v3/internal/pkg/epubimageprocessor"
-	"github.com/celogeek/go-comic-converter/v3/internal/pkg/epuboptions"
 	"github.com/celogeek/go-comic-converter/v3/internal/pkg/epubprogress"
 	"github.com/celogeek/go-comic-converter/v3/internal/pkg/epubtemplates"
 	"github.com/celogeek/go-comic-converter/v3/internal/pkg/epubtree"
 	"github.com/celogeek/go-comic-converter/v3/internal/pkg/epubzip"
 	"github.com/celogeek/go-comic-converter/v3/internal/pkg/utils"
+	"github.com/celogeek/go-comic-converter/v3/pkg/epuboptions"
 )
 
-type EPUB struct {
+type EPUB interface {
+	Write() error
+}
+
+type epub struct {
 	epuboptions.EPUBOptions
 	UID       string
 	Publisher string
@@ -48,18 +53,25 @@ func New(options epuboptions.EPUBOptions) EPUB {
 		"zoom": func(s int, z float32) int { return int(float32(s) * z) },
 	})
 
-	return EPUB{
+	var imageProcessor epubimageprocessor.EPUBImageProcessor
+	if options.Image.Format == "copy" {
+		imageProcessor = epubimagepassthrough.New(options)
+	} else {
+		imageProcessor = epubimageprocessor.New(options)
+	}
+
+	return epub{
 		EPUBOptions:       options,
 		UID:               uid.String(),
 		Publisher:         "GO Comic Converter",
 		UpdatedAt:         time.Now().UTC().Format("2006-01-02T15:04:05Z"),
 		templateProcessor: tmpl,
-		imageProcessor:    epubimageprocessor.New(options),
+		imageProcessor:    imageProcessor,
 	}
 }
 
 // render templates
-func (e EPUB) render(templateString string, data map[string]any) string {
+func (e epub) render(templateString string, data map[string]any) string {
 	var result strings.Builder
 	tmpl := template.Must(e.templateProcessor.Parse(templateString))
 	if err := tmpl.Execute(&result, data); err != nil {
@@ -69,7 +81,7 @@ func (e EPUB) render(templateString string, data map[string]any) string {
 }
 
 // write image to the zip
-func (e EPUB) writeImage(wz epubzip.EPUBZip, img epubimage.EPUBImage, zipImg *zip.File) error {
+func (e epub) writeImage(wz epubzip.EPUBZip, img epubimage.EPUBImage, zipImg *zip.File) error {
 	err := wz.WriteContent(
 		img.EPUBPagePath(),
 		[]byte(e.render(epubtemplates.Text, map[string]any{
@@ -87,7 +99,7 @@ func (e EPUB) writeImage(wz epubzip.EPUBZip, img epubimage.EPUBImage, zipImg *zi
 }
 
 // write blank page
-func (e EPUB) writeBlank(wz epubzip.EPUBZip, img epubimage.EPUBImage) error {
+func (e epub) writeBlank(wz epubzip.EPUBZip, img epubimage.EPUBImage) error {
 	return wz.WriteContent(
 		img.EPUBSpacePath(),
 		[]byte(e.render(epubtemplates.Blank, map[string]any{
@@ -98,7 +110,7 @@ func (e EPUB) writeBlank(wz epubzip.EPUBZip, img epubimage.EPUBImage) error {
 }
 
 // write title image
-func (e EPUB) writeCoverImage(wz epubzip.EPUBZip, img epubimage.EPUBImage, part, totalParts int) error {
+func (e epub) writeCoverImage(wz epubzip.EPUBZip, img epubimage.EPUBImage, part, totalParts int) error {
 	title := "Cover"
 	text := ""
 	if totalParts > 1 {
@@ -111,7 +123,7 @@ func (e EPUB) writeCoverImage(wz epubzip.EPUBZip, img epubimage.EPUBImage, part,
 		[]byte(e.render(epubtemplates.Text, map[string]any{
 			"Title":      title,
 			"ViewPort":   e.Image.View.Port(),
-			"ImagePath":  "Images/cover." + e.Image.Format,
+			"ImagePath":  "Images/cover.jpeg",
 			"ImageStyle": img.ImgStyle(e.Image.View.Width, e.Image.View.Height, ""),
 		})),
 	); err != nil {
@@ -141,7 +153,7 @@ func (e EPUB) writeCoverImage(wz epubzip.EPUBZip, img epubimage.EPUBImage, part,
 }
 
 // write title image
-func (e EPUB) writeTitleImage(wz epubzip.EPUBZip, img epubimage.EPUBImage, title string) error {
+func (e epub) writeTitleImage(wz epubzip.EPUBZip, img epubimage.EPUBImage, title string) error {
 	titleAlign := ""
 	if !e.Image.View.PortraitOnly {
 		if e.Image.Manga {
@@ -168,7 +180,7 @@ func (e EPUB) writeTitleImage(wz epubzip.EPUBZip, img epubimage.EPUBImage, title
 		[]byte(e.render(epubtemplates.Text, map[string]any{
 			"Title":      title,
 			"ViewPort":   e.Image.View.Port(),
-			"ImagePath":  "Images/title." + e.Image.Format,
+			"ImagePath":  "Images/title.jpeg",
 			"ImageStyle": img.ImgStyle(e.Image.View.Width, e.Image.View.Height, titleAlign),
 		})),
 	); err != nil {
@@ -197,7 +209,7 @@ func (e EPUB) writeTitleImage(wz epubzip.EPUBZip, img epubimage.EPUBImage, title
 }
 
 // extract image and split it into part
-func (e EPUB) getParts() (parts []epubPart, imgStorage epubzip.StorageImageReader, err error) {
+func (e epub) getParts() (parts []epubPart, imgStorage epubzip.StorageImageReader, err error) {
 	images, err := e.imageProcessor.Load()
 
 	if err != nil {
@@ -268,7 +280,7 @@ func (e EPUB) getParts() (parts []epubPart, imgStorage epubzip.StorageImageReade
 // create a tree from the directories.
 //
 // this is used to simulate the toc.
-func (e EPUB) getTree(images []epubimage.EPUBImage, skipFiles bool) string {
+func (e epub) getTree(images []epubimage.EPUBImage, skipFiles bool) string {
 	t := epubtree.New()
 	for _, img := range images {
 		if skipFiles {
@@ -285,7 +297,7 @@ func (e EPUB) getTree(images []epubimage.EPUBImage, skipFiles bool) string {
 	return c.WriteString("")
 }
 
-func (e EPUB) computeAspectRatio(epubParts []epubPart) float64 {
+func (e epub) computeAspectRatio(epubParts []epubPart) float64 {
 	var (
 		bestAspectRatio      float64
 		bestAspectRatioCount int
@@ -312,7 +324,7 @@ func (e EPUB) computeAspectRatio(epubParts []epubPart) float64 {
 	return bestAspectRatio
 }
 
-func (e EPUB) computeViewPort(epubParts []epubPart) (int, int) {
+func (e epub) computeViewPort(epubParts []epubPart) (int, int) {
 	if e.Image.View.AspectRatio == -1 {
 		//keep device size
 		return e.Image.View.Width, e.Image.View.Height
@@ -332,7 +344,7 @@ func (e EPUB) computeViewPort(epubParts []epubPart) (int, int) {
 	}
 }
 
-func (e EPUB) writePart(path string, currentPart, totalParts int, part epubPart, imgStorage epubzip.StorageImageReader) error {
+func (e epub) writePart(path string, currentPart, totalParts int, part epubPart, imgStorage epubzip.StorageImageReader) error {
 	hasTitlePage := e.TitlePage == 1 || (e.TitlePage == 2 && totalParts > 1)
 
 	wz, err := epubzip.New(path)
@@ -413,7 +425,7 @@ func (e EPUB) writePart(path string, currentPart, totalParts int, part epubPart,
 }
 
 // create the zip
-func (e EPUB) Write() error {
+func (e epub) Write() error {
 	epubParts, imgStorage, err := e.getParts()
 	if err != nil {
 		return err

pkg/epuboptions/image.go

@@ -20,7 +20,3 @@ type Image struct {
 	Format                    string `yaml:"format" json:"format"`
 	AppleBookCompatibility    bool   `yaml:"apple_book_compatibility" json:"apple_book_compatibility"`
 }
-
-func (i Image) MediaType() string {
-	return "image/" + i.Format
-}