add shortcut

all width/height are computed based on viewport dimension.
images will enlarge if smaller, and resize to fit if larger.

internal/converter/converter.go

@@ -110,7 +110,6 @@ func (c *Converter) InitParse() {
 	c.AddIntParam(&c.Options.Brightness, "brightness", c.Options.Brightness, "Brightness readjustement: between -100 and 100, > 0 lighter, < 0 darker")
 	c.AddIntParam(&c.Options.Contrast, "contrast", c.Options.Contrast, "Contrast readjustement: between -100 and 100, > 0 more contrast, < 0 less contrast")
 	c.AddBoolParam(&c.Options.AutoRotate, "autorotate", c.Options.AutoRotate, "Auto Rotate page when width > height")
-	c.AddBoolParam(&c.Options.Auto, "auto", false, "Activate all automatic options")
 	c.AddBoolParam(&c.Options.AutoSplitDoublePage, "autosplitdoublepage", c.Options.AutoSplitDoublePage, "Auto Split double page when width > height")
 	c.AddBoolParam(&c.Options.NoBlankImage, "noblankimage", c.Options.NoBlankImage, "Remove blank image")
 	c.AddBoolParam(&c.Options.Manga, "manga", c.Options.Manga, "Manga mode (right to left)")
@@ -120,12 +119,22 @@ func (c *Converter) InitParse() {
 	c.AddIntParam(&c.Options.SortPathMode, "sort", c.Options.SortPathMode, "Sort path mode\n0 = alpha for path and file\n1 = alphanum for path and alpha for file\n2 = alphanum for path and file")
 	c.AddStringParam(&c.Options.ForegroundColor, "foreground-color", c.Options.ForegroundColor, "Foreground color in hexa format RGB. Black=000, White=FFF")
 	c.AddStringParam(&c.Options.BackgroundColor, "background-color", c.Options.BackgroundColor, "Background color in hexa format RGB. Black=000, White=FFF, Light Gray=DDD, Dark Gray=777")
+	c.AddBoolParam(&c.Options.NoResize, "noresize", c.Options.NoResize, "Do not reduce image size if exceed device size")
+	c.AddStringParam(&c.Options.Format, "format", c.Options.Format, "Format of output images: jpeg (lossy), png (lossless)")
 
 	c.AddSection("Default config")
 	c.AddBoolParam(&c.Options.Show, "show", false, "Show your default parameters")
 	c.AddBoolParam(&c.Options.Save, "save", false, "Save your parameters as default")
 	c.AddBoolParam(&c.Options.Reset, "reset", false, "Reset your parameters to default")
 
+	c.AddSection("Shortcut")
+	c.AddBoolParam(&c.Options.Auto, "auto", false, "Activate all automatic options")
+	c.AddBoolParam(&c.Options.NoFilter, "nofilter", false, "Deactivate all filters")
+	c.AddBoolParam(&c.Options.MaxQuality, "maxquality", false, "Max quality: color png + noresize")
+	c.AddBoolParam(&c.Options.BestQuality, "bestquality", false, "Max quality: color jpg q100 + noresize")
+	c.AddBoolParam(&c.Options.GreatQuality, "greatquality", false, "Max quality: grayscale jpg q90 + noresize")
+	c.AddBoolParam(&c.Options.GoodQuality, "goodquality", false, "Max quality: grayscale jpg q90")
+
 	c.AddSection("Other")
 	c.AddIntParam(&c.Options.Workers, "workers", runtime.NumCPU(), "Number of workers")
 	c.AddBoolParam(&c.Options.Dry, "dry", false, "Dry run to show all options")
@@ -211,6 +220,36 @@ func (c *Converter) Parse() {
 		c.Options.AutoRotate = true
 		c.Options.AutoSplitDoublePage = true
 	}
+
+	if c.Options.MaxQuality {
+		c.Options.Format = "png"
+		c.Options.Grayscale = false
+		c.Options.NoResize = true
+	} else if c.Options.BestQuality {
+		c.Options.Format = "jpeg"
+		c.Options.Quality = 100
+		c.Options.Grayscale = false
+		c.Options.NoResize = true
+	} else if c.Options.GreatQuality {
+		c.Options.Format = "jpeg"
+		c.Options.Quality = 90
+		c.Options.Grayscale = true
+		c.Options.NoResize = true
+	} else if c.Options.GoodQuality {
+		c.Options.Format = "jpeg"
+		c.Options.Quality = 90
+		c.Options.Grayscale = true
+		c.Options.NoResize = false
+	}
+
+	if c.Options.NoFilter {
+		c.Options.Crop = false
+		c.Options.Brightness = 0
+		c.Options.Contrast = 0
+		c.Options.AutoRotate = false
+		c.Options.NoBlankImage = false
+		c.Options.NoResize = true
+	}
 }
 
 // Check parameters
@@ -307,6 +346,11 @@ func (c *Converter) Validate() error {
 		return errors.New("background color must have color format in hexa: [0-9A-F]{3}")
 	}
 
+	// Format
+	if !(c.Options.Format == "jpeg" || c.Options.Format == "png") {
+		return errors.New("format should be jpeg or png")
+	}
+
 	return nil
 }
 

internal/converter/options/converter_options.go

@@ -31,7 +31,6 @@ type Options struct {
 	CropRatioBottom            int    `yaml:"crop_ratio_bottom"`
 	Brightness                 int    `yaml:"brightness"`
 	Contrast                   int    `yaml:"contrast"`
-	Auto                       bool   `yaml:"-"`
 	AutoRotate                 bool   `yaml:"auto_rotate"`
 	AutoSplitDoublePage        bool   `yaml:"auto_split_double_page"`
 	NoBlankImage               bool   `yaml:"no_blank_image"`
@@ -42,12 +41,22 @@ type Options struct {
 	SortPathMode               int    `yaml:"sort_path_mode"`
 	ForegroundColor            string `yaml:"foreground_color"`
 	BackgroundColor            string `yaml:"background_color"`
+	NoResize                   bool   `yaml:"noresize"`
+	Format                     string `yaml:"format"`
 
 	// Default Config
 	Show  bool `yaml:"-"`
 	Save  bool `yaml:"-"`
 	Reset bool `yaml:"-"`
 
+	// Shortcut
+	Auto         bool `yaml:"-"`
+	NoFilter     bool `yaml:"-"`
+	MaxQuality   bool `yaml:"-"`
+	BestQuality  bool `yaml:"-"`
+	GreatQuality bool `yaml:"-"`
+	GoodQuality  bool `yaml:"-"`
+
 	// Other
 	Workers    int  `yaml:"-"`
 	Dry        bool `yaml:"-"`
@@ -83,6 +92,8 @@ func New() *Options {
 		SortPathMode:               1,
 		ForegroundColor:            "000",
 		BackgroundColor:            "FFF",
+		NoResize:                   false,
+		Format:                     "jpeg",
 		profiles:                   profiles.New(),
 	}
 }
@@ -152,10 +163,6 @@ func (o *Options) ShowConfig() string {
 			perfectHeight,
 		)
 	}
-	limitmb := "nolimit"
-	if o.LimitMb > 0 {
-		limitmb = fmt.Sprintf("%d Mb", o.LimitMb)
-	}
 
 	sortpathmode := ""
 	switch o.SortPathMode {
@@ -169,30 +176,35 @@ func (o *Options) ShowConfig() string {
 
 	var b strings.Builder
 	for _, v := range []struct {
-		K string
-		V any
+		Key       string
+		Value     any
+		Condition bool
 	}{
-		{"Profile", profileDesc},
-		{"ViewRatio", fmt.Sprintf("1:%s", strings.TrimRight(fmt.Sprintf("%f", profiles.PerfectRatio), "0"))},
-		{"View", viewDesc},
-		{"Quality", o.Quality},
-		{"Grayscale", o.Grayscale},
-		{"Crop", o.Crop},
-		{"CropRatio", fmt.Sprintf("%d Left - %d Up - %d Right - %d Bottom", o.CropRatioLeft, o.CropRatioUp, o.CropRatioRight, o.CropRatioBottom)},
-		{"Brightness", o.Brightness},
-		{"Contrast", o.Contrast},
-		{"AutoRotate", o.AutoRotate},
-		{"AutoSplitDoublePage", o.AutoSplitDoublePage},
-		{"NoBlankImage", o.NoBlankImage},
-		{"Manga", o.Manga},
-		{"HasCover", o.HasCover},
-		{"LimitMb", limitmb},
-		{"StripFirstDirectoryFromToc", o.StripFirstDirectoryFromToc},
-		{"SortPathMode", sortpathmode},
-		{"Foreground Color", fmt.Sprintf("#%s", o.ForegroundColor)},
-		{"Background Color", fmt.Sprintf("#%s", o.BackgroundColor)},
+		{"Profile", profileDesc, true},
+		{"ViewRatio", fmt.Sprintf("1:%s", strings.TrimRight(fmt.Sprintf("%f", profiles.PerfectRatio), "0")), true},
+		{"View", viewDesc, true},
+		{"Format", o.Format, true},
+		{"Quality", o.Quality, o.Format == "jpeg"},
+		{"Grayscale", o.Grayscale, true},
+		{"Crop", o.Crop, true},
+		{"CropRatio", fmt.Sprintf("%d Left - %d Up - %d Right - %d Bottom", o.CropRatioLeft, o.CropRatioUp, o.CropRatioRight, o.CropRatioBottom), o.Crop},
+		{"Brightness", o.Brightness, o.Brightness != 0},
+		{"Contrast", o.Contrast, o.Contrast != 0},
+		{"AutoRotate", o.AutoRotate, true},
+		{"AutoSplitDoublePage", o.AutoSplitDoublePage, true},
+		{"NoBlankImage", o.NoBlankImage, true},
+		{"Manga", o.Manga, true},
+		{"HasCover", o.HasCover, true},
+		{"LimitMb", fmt.Sprintf("%d Mb", o.LimitMb), o.LimitMb != 0},
+		{"StripFirstDirectoryFromToc", o.StripFirstDirectoryFromToc, true},
+		{"SortPathMode", sortpathmode, true},
+		{"Foreground Color", fmt.Sprintf("#%s", o.ForegroundColor), true},
+		{"Background Color", fmt.Sprintf("#%s", o.BackgroundColor), true},
+		{"Resize", !o.NoResize, true},
 	} {
-		b.WriteString(fmt.Sprintf("\n    %-26s: %v", v.K, v.V))
+		if v.Condition {
+			b.WriteString(fmt.Sprintf("\n    %-26s: %v", v.Key, v.Value))
+		}
 	}
 	return b.String()
 }

internal/epub/epub.go

@@ -282,7 +282,7 @@ func (e *ePub) Write() error {
 			{"OEBPS/Text/title.xhtml", e.render(epubtemplates.Text, map[string]any{
 				"Title":      title,
 				"ViewPort":   fmt.Sprintf("width=%d,height=%d", e.Image.View.Width, e.Image.View.Height),
-				"ImagePath":  "Images/title.jpg",
+				"ImagePath":  fmt.Sprintf("Images/title.%s", e.Image.Format),
 				"ImageStyle": part.Cover.ImgStyle(e.Image.View.Width, e.Image.View.Height, titleAlign),
 			})},
 		}

internal/epub/image/epub_image.go

@@ -6,6 +6,7 @@ package epubimage
 import (
 	"fmt"
 	"image"
+	"strings"
 )
 
 type Image struct {
@@ -20,6 +21,7 @@ type Image struct {
 	Path       string
 	Name       string
 	Position   string
+	Format     string
 }
 
 // key name of the blank plage after the image
@@ -59,7 +61,7 @@ func (i *Image) ImgKey() string {
 
 // image path
 func (i *Image) ImgPath() string {
-	return fmt.Sprintf("Images/%s.jpg", i.ImgKey())
+	return fmt.Sprintf("Images/%s.%s", i.ImgKey(), i.Format)
 }
 
 // image path into the EPUB
@@ -72,24 +74,48 @@ func (i *Image) EPUBImgPath() string {
 // center by default.
 // align to left or right if it's part of the splitted double page.
 func (i *Image) ImgStyle(viewWidth, viewHeight int, align string) string {
-	marginW, marginH := float64(viewWidth-i.Width)/2, float64(viewHeight-i.Height)/2
+	relWidth, relHeight := i.RelSize(viewWidth, viewHeight)
+	marginW, marginH := float64(viewWidth-relWidth)/2, float64(viewHeight-relHeight)/2
 
+	style := []string{}
+
+	style = append(style, fmt.Sprintf("width:%dpx", relWidth))
+	style = append(style, fmt.Sprintf("height:%dpx", relHeight))
+	style = append(style, fmt.Sprintf("top:%.2f%%", marginH*100/float64(viewHeight)))
 	if align == "" {
 		switch i.Position {
 		case "rendition:page-spread-left":
-			align = "right:0"
+			style = append(style, "right:0")
 		case "rendition:page-spread-right":
-			align = "left:0"
+			style = append(style, "left:0")
 		default:
-			align = fmt.Sprintf("left:%.2f%%", marginW*100/float64(viewWidth))
+			style = append(style, fmt.Sprintf("left:%.2f%%", marginW*100/float64(viewWidth)))
 		}
+	} else {
+		style = append(style, align)
 	}
 
-	return fmt.Sprintf(
-		"width:%dpx; height:%dpx; top:%.2f%%; %s;",
-		i.Width,
-		i.Height,
-		marginH*100/float64(viewHeight),
-		align,
-	)
+	return strings.Join(style, "; ")
+}
+
+func (i *Image) RelSize(viewWidth, viewHeight int) (relWidth, relHeight int) {
+	w, h := viewWidth, viewHeight
+	srcw, srch := i.Width, i.Height
+
+	if w <= 0 || h <= 0 || srcw <= 0 || srch <= 0 {
+		return
+	}
+
+	wratio := float64(srcw) / float64(w)
+	hratio := float64(srch) / float64(h)
+
+	if wratio > hratio {
+		relWidth = w
+		relHeight = int(float64(srch)/wratio + 0.5)
+	} else {
+		relHeight = h
+		relWidth = int(float64(srcw)/hratio + 0.5)
+	}
+
+	return
 }

internal/epub/imagefilters/epub_image_filters_resize.go

@@ -1,48 +0,0 @@
-package epubimagefilters
-
-import (
-	"image"
-	"image/draw"
-
-	"github.com/disintegration/gift"
-)
-
-// Resize image by keeping aspect ratio.
-// This will reduce or enlarge image to fit into the viewWidth and viewHeight.
-func Resize(viewWidth, viewHeight int, resampling gift.Resampling) gift.Filter {
-	return &resizeFilter{
-		viewWidth, viewHeight, resampling,
-	}
-}
-
-type resizeFilter struct {
-	viewWidth, viewHeight int
-	resampling            gift.Resampling
-}
-
-func (p *resizeFilter) Bounds(srcBounds image.Rectangle) image.Rectangle {
-	w, h := p.viewWidth, p.viewHeight
-	srcw, srch := srcBounds.Dx(), srcBounds.Dy()
-
-	if w <= 0 || h <= 0 || srcw <= 0 || srch <= 0 {
-		return image.Rect(0, 0, 0, 0)
-	}
-
-	wratio := float64(srcw) / float64(w)
-	hratio := float64(srch) / float64(h)
-
-	var dstw, dsth int
-	if wratio > hratio {
-		dstw = w
-		dsth = int(float64(srch)/wratio + 0.5)
-	} else {
-		dsth = h
-		dstw = int(float64(srcw)/hratio + 0.5)
-	}
-
-	return image.Rect(0, 0, dstw, dsth)
-}
-
-func (p *resizeFilter) Draw(dst draw.Image, src image.Image, options *gift.Options) {
-	gift.Resize(dst.Bounds().Dx(), dst.Bounds().Dy(), p.resampling).Draw(dst, src, options)
-}

internal/epub/imageprocessor/epub_image_processor.go

@@ -41,6 +41,7 @@ func (e *EPUBImageProcessor) Load() (images []*epubimage.Image, err error) {
 				Id:     img.Id,
 				Path:   img.Path,
 				Name:   img.Name,
+				Format: e.Image.Format,
 			})
 		}
 
@@ -59,13 +60,17 @@ func (e *EPUBImageProcessor) Load() (images []*epubimage.Image, err error) {
 	})
 	wg := &sync.WaitGroup{}
 
-	imgStorage, err := epubzip.NewEPUBZipStorageImageWriter(e.ImgStorage())
+	imgStorage, err := epubzip.NewEPUBZipStorageImageWriter(e.ImgStorage(), e.Image.Format)
 	if err != nil {
 		bar.Close()
 		return nil, err
 	}
 
-	for i := 0; i < e.WorkersRatio(50); i++ {
+	wr := 50
+	if e.Image.Format == "png" {
+		wr = 100
+	}
+	for i := 0; i < e.WorkersRatio(wr); i++ {
 		wg.Add(1)
 		go func() {
 			defer wg.Done()
@@ -90,6 +95,7 @@ func (e *EPUBImageProcessor) Load() (images []*epubimage.Image, err error) {
 						DoublePage: part == 0 && src.Bounds().Dx() > src.Bounds().Dy(),
 						Path:       input.Path,
 						Name:       input.Name,
+						Format:     e.Image.Format,
 					}
 
 					if err = imgStorage.Add(img.EPUBImgPath(), dst, e.Image.Quality); err != nil {
@@ -201,10 +207,12 @@ func (e *EPUBImageProcessor) transformImage(src image.Image, srcId int) []image.
 		splitFilter = append(splitFilter, f)
 	}
 
-	filters = append(filters,
-		epubimagefilters.Resize(e.Image.View.Width, e.Image.View.Height, gift.LanczosResampling),
-		epubimagefilters.Pixel(),
-	)
+	if e.Image.Resize {
+		f := gift.ResizeToFit(e.Image.View.Width, e.Image.View.Height, gift.LanczosResampling)
+		filters = append(filters, f)
+	}
+
+	filters = append(filters, epubimagefilters.Pixel())
 
 	// convert
 	{
@@ -232,10 +240,10 @@ func (e *EPUBImageProcessor) transformImage(src image.Image, srcId int) []image.
 	// convert double page
 	for _, b := range []bool{e.Image.Manga, !e.Image.Manga} {
 		g := gift.New(splitFilter...)
-		g.Add(
-			epubimagefilters.CropSplitDoublePage(b),
-			epubimagefilters.Resize(e.Image.View.Width, e.Image.View.Height, gift.LanczosResampling),
-		)
+		g.Add(epubimagefilters.CropSplitDoublePage(b))
+		if e.Image.Resize {
+			g.Add(gift.ResizeToFit(e.Image.View.Width, e.Image.View.Height, gift.LanczosResampling))
+		}
 		dst := e.createImage(src, g.Bounds(src.Bounds()))
 		g.Draw(dst, src)
 		images = append(images, dst)
@@ -251,5 +259,10 @@ func (e *EPUBImageProcessor) CoverTitleData(src image.Image, title string) (*epu
 	dst := e.createImage(src, g.Bounds(src.Bounds()))
 	g.Draw(dst, src)
 
-	return epubzip.CompressImage("OEBPS/Images/title.jpg", dst, e.Image.Quality)
+	return epubzip.CompressImage(
+		fmt.Sprintf("OEBPS/Images/title.%s", e.Image.Format),
+		e.Image.Format,
+		dst,
+		e.Image.Quality,
+	)
 }

internal/epub/options/epub_options.go

@@ -31,6 +31,8 @@ type Image struct {
 	HasCover            bool
 	View                *View
 	GrayScale           bool
+	Resize              bool
+	Format              string
 }
 
 type Options struct {

internal/epub/templates/epub_templates_content.go

@@ -127,7 +127,7 @@ func getManifest(o *ContentOptions) []tag {
 	var imageTags, pageTags, spaceTags []tag
 	addTag := func(img *epubimage.Image, withSpace bool) {
 		imageTags = append(imageTags,
-			tag{"item", tagAttrs{"id": img.ImgKey(), "href": img.ImgPath(), "media-type": "image/jpeg"}, ""},
+			tag{"item", tagAttrs{"id": img.ImgKey(), "href": img.ImgPath(), "media-type": fmt.Sprintf("image/%s", o.ImageOptions.Format)}, ""},
 		)
 		pageTags = append(pageTags,
 			tag{"item", tagAttrs{"id": img.PageKey(), "href": img.PagePath(), "media-type": "application/xhtml+xml"}, ""},
@@ -144,7 +144,7 @@ func getManifest(o *ContentOptions) []tag {
 		{"item", tagAttrs{"id": "css", "href": "Text/style.css", "media-type": "text/css"}, ""},
 		{"item", tagAttrs{"id": "space_title", "href": "Text/space_title.xhtml", "media-type": "application/xhtml+xml"}, ""},
 		{"item", tagAttrs{"id": "page_title", "href": "Text/title.xhtml", "media-type": "application/xhtml+xml"}, ""},
-		{"item", tagAttrs{"id": "img_title", "href": "Images/title.jpg", "media-type": "image/jpeg"}, ""},
+		{"item", tagAttrs{"id": "img_title", "href": fmt.Sprintf("Images/title.%s", o.ImageOptions.Format), "media-type": fmt.Sprintf("image/%s", o.ImageOptions.Format)}, ""},
 	}
 
 	if o.ImageOptions.HasCover || o.Current > 1 {

internal/epub/templates/epub_templates_text.xhtml.tmpl

@@ -8,8 +8,6 @@
     <meta name="viewport" content="{{ .ViewPort }}"/>
   </head>
   <body>
-    <div>
     <img src="../{{ .ImagePath }}" alt="{{ .Title }}" style="{{ .ImageStyle }}"/>
-    </div>
   </body>
 </html>

internal/epub/zip/epub_zip_image.go

@@ -4,9 +4,11 @@ import (
 	"archive/zip"
 	"bytes"
 	"compress/flate"
+	"fmt"
 	"hash/crc32"
 	"image"
 	"image/jpeg"
+	"image/png"
 	"time"
 )
 
@@ -16,13 +18,20 @@ type ZipImage struct {
 }
 
 // create gzip encoded jpeg
-func CompressImage(filename string, img image.Image, quality int) (*ZipImage, error) {
+func CompressImage(filename string, format string, img image.Image, quality int) (*ZipImage, error) {
 	var (
 		data, cdata bytes.Buffer
 		err         error
 	)
 
+	switch format {
+	case "png":
+		err = png.Encode(&data, img)
+	case "jpeg":
 		err = jpeg.Encode(&data, img, &jpeg.Options{Quality: quality})
+	default:
+		err = fmt.Errorf("unknown format %q", format)
+	}
 	if err != nil {
 		return nil, err
 	}

internal/epub/zip/epub_zip_storage_image.go

@@ -10,17 +10,17 @@ import (
 type EPUBZipStorageImageWriter struct {
 	fh     *os.File
 	fz     *zip.Writer
-
+	format string
 	mut    *sync.Mutex
 }
 
-func NewEPUBZipStorageImageWriter(filename string) (*EPUBZipStorageImageWriter, error) {
+func NewEPUBZipStorageImageWriter(filename string, format string) (*EPUBZipStorageImageWriter, error) {
 	fh, err := os.Create(filename)
 	if err != nil {
 		return nil, err
 	}
 	fz := zip.NewWriter(fh)
-	return &EPUBZipStorageImageWriter{fh, fz, &sync.Mutex{}}, nil
+	return &EPUBZipStorageImageWriter{fh, fz, format, &sync.Mutex{}}, nil
 }
 
 func (e *EPUBZipStorageImageWriter) Close() error {
@@ -32,7 +32,7 @@ func (e *EPUBZipStorageImageWriter) Close() error {
 }
 
 func (e *EPUBZipStorageImageWriter) Add(filename string, img image.Image, quality int) error {
-	zipImage, err := CompressImage(filename, img, quality)
+	zipImage, err := CompressImage(filename, e.format, img, quality)
 	if err != nil {
 		return err
 	}

main.go

@@ -138,6 +138,8 @@ $ go install github.com/celogeek/go-comic-converter/v%d@%s
 					Background: cmd.Options.BackgroundColor,
 				},
 			},
+			Resize: !cmd.Options.NoResize,
+			Format: cmd.Options.Format,
 		},
 	}).Write(); err != nil {
 		fmt.Fprintf(os.Stderr, "Error: %v\n", err)