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add grayscale option

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This commit is contained in:
Milan Nikolic
2015-11-03 22:13:21 +01:00
parent 0c6b9fcaa8
commit 85818eec5f
2 changed files with 31 additions and 4 deletions
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34
cbconvert.go
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@@ -87,7 +87,7 @@ type options struct {
ToBMP bool // encode images to 4-Bit BMP (16 colors) instead of JPEG
ToGIF bool // encode images to GIF instead of JPEG
Quality int // JPEG image quality
NoRGB bool // do not convert images with RGB colorspace
NoRGB bool // do not convert images that have RGB colorspace
Width int // image width
Height int // image height
Filter int // 0=NearestNeighbor, 1=Box, 2=Linear, 3=MitchellNetravali, 4=CatmullRom, 6=Gaussian, 7=Lanczos
@@ -95,6 +95,7 @@ type options struct {
Cover bool // extract cover
Thumbnail bool // extract cover thumbnail (freedesktop spec.)
Outdir string // output directory
Grayscale bool // convert images to grayscale (monochromatic)
Recursive bool // process subdirectories recursively
Size int64 // process only files larger then size (in MB)
Quiet bool // hide console output
@@ -127,12 +128,17 @@ func convertImage(img image.Image, index int, pathName string) {
}
var i image.Image
if opts.Width > 0 || opts.Height > 0 {
i = imaging.Resize(img, opts.Width, opts.Height, filters[opts.Filter])
} else {
i = img
}
if opts.Grayscale {
i = imaging.Grayscale(img)
}
if opts.ToPNG {
// convert image to PNG
f, err := os.Create(filename)
@@ -160,13 +166,18 @@ func convertImage(img image.Image, index int, pathName string) {
w.SetColor("black")
defer w.Destroy()
var cs imagick.ColorspaceType = imagick.COLORSPACE_SRGB
if opts.Grayscale {
cs = imagick.COLORSPACE_GRAY
}
mw.SetImageFormat("BMP3")
mw.SetImageBackgroundColor(w)
mw.SetImageAlphaChannel(imagick.ALPHA_CHANNEL_REMOVE)
mw.SetImageAlphaChannel(imagick.ALPHA_CHANNEL_DEACTIVATE)
mw.SetImageMatte(false)
mw.SetImageCompression(imagick.COMPRESSION_NO)
mw.QuantizeImage(16, imagick.COLORSPACE_SRGB, 8, true, true)
mw.QuantizeImage(16, cs, 8, true, true)
mw.WriteImage(filename)
} else if opts.ToGIF {
// convert image to GIF
@@ -182,12 +193,18 @@ func convertImage(img image.Image, index int, pathName string) {
if err != nil {
fmt.Fprintf(os.Stderr, "Error ReadImageBlob: %v\n", err.Error())
}
var cs imagick.ColorspaceType = imagick.COLORSPACE_SRGB
if opts.Grayscale {
cs = imagick.COLORSPACE_GRAY
}
mw.SetImageFormat("GIF")
mw.SetImageAlphaChannel(imagick.ALPHA_CHANNEL_REMOVE)
mw.SetImageAlphaChannel(imagick.ALPHA_CHANNEL_DEACTIVATE)
mw.SetImageMatte(false)
mw.SetImageCompression(imagick.COMPRESSION_LZW)
mw.QuantizeImage(16, imagick.COLORSPACE_SRGB, 8, true, true)
mw.QuantizeImage(256, cs, 8, true, true)
mw.WriteImage(filename)
} else {
// convert image to JPEG (default)
@@ -734,6 +751,10 @@ func extractCover(file string, info os.FileInfo) {
cover = imaging.Resize(cover, opts.Width, opts.Height, filters[opts.Filter])
}
if opts.Grayscale {
cover = imaging.Grayscale(cover)
}
filename := filepath.Join(opts.Outdir, fmt.Sprintf("%s.jpg", getBasename(file)))
f, err := os.Create(filename)
if err != nil {
@@ -768,6 +789,10 @@ func extractThumbnail(file string, info os.FileInfo) {
cover = imaging.Resize(cover, 256, 0, filters[opts.Filter])
}
if opts.Grayscale {
cover = imaging.Grayscale(cover)
}
imagick.Initialize()
mw := imagick.NewMagickWand()
@@ -820,14 +845,15 @@ func parseFlags() {
kingpin.Flag("width", "image width").Default(strconv.Itoa(0)).Short('w').IntVar(&opts.Width)
kingpin.Flag("height", "image height").Default(strconv.Itoa(0)).Short('h').IntVar(&opts.Height)
kingpin.Flag("quality", "JPEG image quality").Short('q').Default(strconv.Itoa(jpeg.DefaultQuality)).IntVar(&opts.Quality)
kingpin.Flag("norgb", "do not convert images with RGB colorspace").Short('n').BoolVar(&opts.NoRGB)
kingpin.Flag("filter", "0=NearestNeighbor, 1=Box, 2=Linear, 3=MitchellNetravali, 4=CatmullRom, 6=Gaussian, 7=Lanczos").Short('f').
Default(strconv.Itoa(NearestNeighbor)).IntVar(&opts.Filter)
kingpin.Flag("norgb", "do not convert images that have RGB colorspace").Short('n').BoolVar(&opts.NoRGB)
kingpin.Flag("suffix", "add suffix to file basename").Short('s').StringVar(&opts.Suffix)
kingpin.Flag("cover", "extract cover").Short('c').BoolVar(&opts.Cover)
kingpin.Flag("thumbnail", "extract cover thumbnail (freedesktop spec.)").Short('t').BoolVar(&opts.Thumbnail)
kingpin.Flag("outdir", "output directory").Default(".").Short('o').StringVar(&opts.Outdir)
kingpin.Flag("size", "process only files larger then size (in MB)").Short('m').Default(strconv.Itoa(0)).Int64Var(&opts.Size)
kingpin.Flag("grayscale", "convert images to grayscale (monochromatic)").Short('G').BoolVar(&opts.Grayscale)
kingpin.Flag("recursive", "process subdirectories recursively").Short('R').BoolVar(&opts.Recursive)
kingpin.Flag("quiet", "hide console output").Short('Q').BoolVar(&opts.Quiet)
kingpin.Arg("args", "filename or directory").Required().ExistingFilesOrDirsVar(&arguments)