celogeek/go-comic-converter
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use 8bits gray scale instead of palette

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Palette limit the number of color to 16.
But kindle seems to handle more.

Remove the palette, and let the kindle handle the shade of gray
This commit is contained in:
Celogeek 2023-04-10 11:53:53 +02:00
parent 34ed40e26c
commit bb5659277b
Signed by: celogeek
SSH Key Fingerprint: SHA256:njNJLzoLQdbV9PC6ehcruRb0QnEgxABoCYZ+0+aUIYc
6 changed files with 28 additions and 84 deletions
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3
internal/converter/options/core.go
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@ -117,12 +117,11 @@ func (o *Options) ShowDefault() string {
profile := o.GetProfile()
if profile != nil {
profileDesc = fmt.Sprintf(
"%s - %s - %dx%d - %d levels of gray",
"%s - %s - %dx%d",
o.Profile,
profile.Description,
profile.Width,
profile.Height,
len(profile.Palette),
)
}
limitmb := "nolimit"

55
internal/converter/profiles/core.go
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@ -2,10 +2,7 @@ package profiles
import (
"fmt"
"image/color"
"strings"
"github.com/celogeek/go-comic-converter/v2/internal/epub"
)
type Profile struct {
@ -13,38 +10,37 @@ type Profile struct {
Description string
Width int
Height int
Palette color.Palette
}
type Profiles []Profile
func New() Profiles {
return []Profile{
{"K1", "Kindle 1", 600, 670, epub.PALETTE_4},
{"K11", "Kindle 11", 1072, 1448, epub.PALETTE_16},
{"K2", "Kindle 2", 600, 670, epub.PALETTE_15},
{"K34", "Kindle Keyboard/Touch", 600, 800, epub.PALETTE_16},
{"K578", "Kindle", 600, 800, epub.PALETTE_16},
{"KDX", "Kindle DX/DXG", 824, 1000, epub.PALETTE_16},
{"KPW", "Kindle Paperwhite 1/2", 758, 1024, epub.PALETTE_16},
{"KV", "Kindle Paperwhite 3/4/Voyage/Oasis", 1072, 1448, epub.PALETTE_16},
{"KPW5", "Kindle Paperwhite 5/Signature Edition", 1236, 1648, epub.PALETTE_16},
{"KO", "Kindle Oasis 2/3", 1264, 1680, epub.PALETTE_16},
{"KS", "Kindle Scribe", 1860, 2480, epub.PALETTE_16},
{"K1", "Kindle 1", 600, 670},
{"K11", "Kindle 11", 1072, 1448},
{"K2", "Kindle 2", 600, 670},
{"K34", "Kindle Keyboard/Touch", 600, 800},
{"K578", "Kindle", 600, 800},
{"KDX", "Kindle DX/DXG", 824, 1000},
{"KPW", "Kindle Paperwhite 1/2", 758, 1024},
{"KV", "Kindle Paperwhite 3/4/Voyage/Oasis", 1072, 1448},
{"KPW5", "Kindle Paperwhite 5/Signature Edition", 1236, 1648},
{"KO", "Kindle Oasis 2/3", 1264, 1680},
{"KS", "Kindle Scribe", 1860, 2480},
// Kobo
{"KoMT", "Kobo Mini/Touch", 600, 800, epub.PALETTE_16},
{"KoG", "Kobo Glo", 768, 1024, epub.PALETTE_16},
{"KoGHD", "Kobo Glo HD", 1072, 1448, epub.PALETTE_16},
{"KoA", "Kobo Aura", 758, 1024, epub.PALETTE_16},
{"KoAHD", "Kobo Aura HD", 1080, 1440, epub.PALETTE_16},
{"KoAH2O", "Kobo Aura H2O", 1080, 1430, epub.PALETTE_16},
{"KoAO", "Kobo Aura ONE", 1404, 1872, epub.PALETTE_16},
{"KoN", "Kobo Nia", 758, 1024, epub.PALETTE_16},
{"KoC", "Kobo Clara HD/Kobo Clara 2E", 1072, 1448, epub.PALETTE_16},
{"KoL", "Kobo Libra H2O/Kobo Libra 2", 1264, 1680, epub.PALETTE_16},
{"KoF", "Kobo Forma", 1440, 1920, epub.PALETTE_16},
{"KoS", "Kobo Sage", 1440, 1920, epub.PALETTE_16},
{"KoE", "Kobo Elipsa", 1404, 1872, epub.PALETTE_16},
{"KoMT", "Kobo Mini/Touch", 600, 800},
{"KoG", "Kobo Glo", 768, 1024},
{"KoGHD", "Kobo Glo HD", 1072, 1448},
{"KoA", "Kobo Aura", 758, 1024},
{"KoAHD", "Kobo Aura HD", 1080, 1440},
{"KoAH2O", "Kobo Aura H2O", 1080, 1430},
{"KoAO", "Kobo Aura ONE", 1404, 1872},
{"KoN", "Kobo Nia", 758, 1024},
{"KoC", "Kobo Clara HD/Kobo Clara 2E", 1072, 1448},
{"KoL", "Kobo Libra H2O/Kobo Libra 2", 1264, 1680},
{"KoF", "Kobo Forma", 1440, 1920},
{"KoS", "Kobo Sage", 1440, 1920},
{"KoE", "Kobo Elipsa", 1404, 1872},
}
}
@ -52,10 +48,9 @@ func (p Profiles) String() string {
s := make([]string, 0)
for _, v := range p {
s = append(s, fmt.Sprintf(
" - %-7s ( %9s ) - %2d levels of gray - %s",
" - %-7s ( %9s ) - %s",
v.Code,
fmt.Sprintf("%dx%d", v.Width, v.Height),
len(v.Palette),
v.Description,
))
}

2
internal/epub/core.go
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@ -3,7 +3,6 @@ package epub
import (
"encoding/xml"
"fmt"
"image/color"
"os"
"path/filepath"
"regexp"
@ -21,7 +20,6 @@ type ImageOptions struct {
ViewHeight int
Quality int
Algo string
Palette color.Palette
Brightness int
Contrast int
AutoRotate bool

4
internal/epub/image_processing.go
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@ -176,7 +176,7 @@ func (e *ePub) LoadImages() ([]*Image, error) {
g := NewGift(e.ImageOptions)
// Convert image
dst := image.NewPaletted(g.Bounds(src.Bounds()), e.ImageOptions.Palette)
dst := image.NewGray(g.Bounds(src.Bounds()))
g.Draw(dst, src)
imageOutput <- &Image{
@ -202,7 +202,7 @@ func (e *ePub) LoadImages() ([]*Image, error) {
gifts := NewGiftSplitDoublePage(e.ImageOptions)
for i, g := range gifts {
part := i + 1
dst := image.NewPaletted(g.Bounds(src.Bounds()), e.ImageOptions.Palette)
dst := image.NewGray(g.Bounds(src.Bounds()))
g.Draw(dst, src)
imageOutput <- &Image{
Id: img.Id,

47
internal/epub/palettes.go
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@ -1,47 +0,0 @@
package epub
import "image/color"
var PALETTE_16 = color.Palette{
color.Gray{0x00},
color.Gray{0x11},
color.Gray{0x22},
color.Gray{0x33},
color.Gray{0x44},
color.Gray{0x55},
color.Gray{0x66},
color.Gray{0x77},
color.Gray{0x88},
color.Gray{0x99},
color.Gray{0xaa},
color.Gray{0xbb},
color.Gray{0xcc},
color.Gray{0xdd},
color.Gray{0xee},
color.Gray{0xff},
}
var PALETTE_15 = color.Palette{
color.Gray{0x00},
color.Gray{0x11},
color.Gray{0x22},
color.Gray{0x33},
color.Gray{0x44},
color.Gray{0x55},
color.Gray{0x66},
color.Gray{0x77},
color.Gray{0x88},
color.Gray{0x99},
color.Gray{0xaa},
color.Gray{0xbb},
color.Gray{0xcc},
color.Gray{0xdd},
color.Gray{0xff},
}
var PALETTE_4 = color.Palette{
color.Gray{0x00},
color.Gray{0x55},
color.Gray{0xaa},
color.Gray{0xff},
}

1
main.go
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@ -106,7 +106,6 @@ $ go install github.com/celogeek/go-comic-converter/v%d@%s
ViewHeight: profile.Height,
Quality: cmd.Options.Quality,
Crop: cmd.Options.Crop,
Palette: profile.Palette,
Brightness: cmd.Options.Brightness,
Contrast: cmd.Options.Contrast,
AutoRotate: cmd.Options.AutoRotate,