func main() {
flag.Parse()
if len(*destination) > 0 {
err := os.MkdirAll(*destination, os.ModePerm)
if err != nil {
fmt.Printf("Unable to create destination: %s\n", err)
os.Exit(1)
}
}
extMatch := regexp.MustCompile(`\.[a-zA-Z0-9]+$`)
filelist := flag.Args()
// if len(filelist) == 0 {
// filelist = []string{"./*.*"}
// }
for _, srcArg := range filelist {
srcFilenames, err := filepath.Glob(srcArg)
if err != nil {
log.Printf("Glob error: %s\n", err)
continue
}
for _, srcFilename := range srcFilenames {
fmt.Printf("Processing [%s]... ", srcFilename)
src, err := imaging.Open(srcFilename)
if err != nil {
log.Printf("error: %s\n", err)
continue
}
dest := imaging.Grayscale(src)
extension := *output
if extension == "" {
extension = strings.TrimLeft(filepath.Ext(srcFilename), ".")
}
destFilename := extMatch.ReplaceAllString(srcFilename, "") + fmt.Sprintf("-grayscale.%s", extension)
if len(*destination) > 0 {
_, file := filepath.Split(destFilename)
destFilename = filepath.Join(*destination, file)
}
err = imaging.Save(dest, destFilename)
if err != nil {
log.Printf("error: %s\n", err)
continue
}
fmt.Printf("OK; written to %s\n", destFilename)
}
}
}
// GetHash returns a phash string for a JPEG image
func GetHash(reader io.Reader) (string, error) {
image, err := imaging.Decode(reader)
if err != nil {
return "", err
}
image = imaging.Resize(image, 32, 32, imaging.Lanczos)
image = imaging.Grayscale(image)
imageMatrixData := getImageMatrix(image)
dctMatrix := getDCTMatrix(imageMatrixData)
smallDctMatrix := reduceMatrix(dctMatrix, 8)
dctMeanValue := calculateMeanValue(smallDctMatrix)
return buildHash(smallDctMatrix, dctMeanValue), nil
}
func cancellationAntiAliasing(img *image.RGBA) *image.NRGBA {
if debug {
fmt.Println("cancellationAntiAliasing")
}
gray := imaging.Grayscale(img)
//imaging.Save(gray, "./grayscaled.png")
w := gray.Rect.Max.X
h := gray.Rect.Max.Y
for y := 0; y < h; y++ {
for x := 0; x < w; x++ {
r, _, _, _ := gray.At(x, y).RGBA()
if r > 38000 {
c := color.RGBA{0xff, 0xff, 0xff, 0xff}
gray.Set(x, y, c)
} else {
c := color.RGBA{0x00, 0x00, 0x00, 0xff}
gray.Set(x, y, c)
}
}
}
return gray
}
// Provides image://cover/
func (c *Comics) CoverProvider(file string, width int, height int) image.Image {
c.Conv.Opts = c.GetOptions()
stat, err := os.Stat(file)
if err != nil {
fmt.Fprintf(os.Stderr, "Error Stat CoverProvider: %v\n", err.Error())
return image.NewRGBA(image.Rect(0, 0, width, height))
}
cover, err := c.Conv.GetCoverImage(file, stat)
if err != nil {
fmt.Fprintf(os.Stderr, "Error GetCoverImage: %v\n", err.Error())
return image.NewRGBA(image.Rect(0, 0, width, height))
}
cover = c.Conv.TransformImage(cover)
if c.Conv.Opts.LevelsInMin != 0 || c.Conv.Opts.LevelsInMax != 255 || c.Conv.Opts.LevelsGamma != 1.00 ||
c.Conv.Opts.LevelsOutMin != 0 || c.Conv.Opts.LevelsOutMax != 255 {
cover = c.Conv.LevelImage(cover)
}
// imaging is used for preview only
if c.Conv.Opts.Grayscale {
cover = imaging.Grayscale(cover)
}
// size preview
s := 0
b := new(bytes.Buffer)
w := 0
h := 0
switch c.Conv.Opts.Format {
case "jpeg":
jpeg.Encode(b, cover, &jpeg.Options{c.Conv.Opts.Quality})
s = len(b.Bytes())
cover, _ = jpeg.Decode(bytes.NewReader(b.Bytes()))
config, _, _ := image.DecodeConfig(bytes.NewReader(b.Bytes()))
w = config.Width
h = config.Height
case "png":
png.Encode(b, cover)
s = len(b.Bytes())
cover, _ = png.Decode(bytes.NewReader(b.Bytes()))
config, _, _ := image.DecodeConfig(bytes.NewReader(b.Bytes()))
w = config.Width
h = config.Height
case "gif":
mw := imagick.NewMagickWand()
defer mw.Destroy()
mw.ReadImageBlob(c.Conv.GetImageBytes(cover))
mw.SetImageFormat("GIF")
blob := mw.GetImageBlob()
s = len(blob)
cover, _ = gif.Decode(bytes.NewReader(blob))
config, _, _ := image.DecodeConfig(bytes.NewReader(blob))
w = config.Width
h = config.Height
case "tiff":
tiff.Encode(b, cover, &tiff.Options{tiff.Uncompressed, false})
var buf bytes.Buffer
gz := gzip.NewWriter(&buf)
gz.Write(b.Bytes())
gz.Close()
s = buf.Len()
cover, _ = tiff.Decode(bytes.NewReader(b.Bytes()))
config, _, _ := image.DecodeConfig(bytes.NewReader(b.Bytes()))
w = config.Width
h = config.Height
case "bmp":
mw := imagick.NewMagickWand()
defer mw.Destroy()
bb := c.Conv.GetImageBytes(cover)
mw.ReadImageBlob(bb)
wand := imagick.NewPixelWand()
wand.SetColor("black")
defer wand.Destroy()
mw.SetImageFormat("BMP3")
mw.SetImageBackgroundColor(wand)
mw.SetImageAlphaChannel(imagick.ALPHA_CHANNEL_REMOVE)
mw.SetImageAlphaChannel(imagick.ALPHA_CHANNEL_DEACTIVATE)
mw.SetImageMatte(false)
mw.SetImageCompression(imagick.COMPRESSION_NO)
mw.QuantizeImage(16, mw.GetImageColorspace(), 8, true, true)
var buf bytes.Buffer
blob := mw.GetImageBlob()
gz := gzip.NewWriter(&buf)
gz.Write(blob)
gz.Close()
s = buf.Len()
cover, _ = bmp.Decode(bytes.NewReader(blob))
config, _, _ := image.DecodeConfig(bytes.NewReader(bb))
w = config.Width
h = config.Height
}
if cover == nil {
return image.NewRGBA(image.Rect(0, 0, width, height))
}
human := humanize.IBytes(uint64(s))
c.Root.ObjectByName("sizePreview").Set("text", fmt.Sprintf("%s (%dx%d)", human, w, h))
return cover
}