Created
February 9, 2016 14:33
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PNG をY,Cb,Crに分解 (バージョン2)
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package main | |
// http://blog.golang.org/go-image-package | |
// http://d.hatena.ne.jp/taknb2nch/20131231/1388500659 | |
import ( | |
"flag" | |
"fmt" | |
"image" | |
"image/color" | |
"image/png" | |
"os" | |
) | |
func main() { | |
flag.Parse() | |
file_in := flag.Arg(0) | |
file_out := flag.Arg(1) | |
fd_in, err := os.Open(file_in) | |
if err != nil { | |
fmt.Fprintln(os.Stderr, "not found:"+file_in) | |
os.Exit(1) | |
} | |
fd_out, err := os.Create(file_out) | |
if err != nil { | |
fmt.Fprintln(os.Stderr, "not found:"+file_out) | |
os.Exit(1) | |
} | |
image_in, _ := png.Decode(fd_in) | |
rect := image_in.Bounds() | |
size := rect.Size() | |
image_out := image.NewNRGBA(image.Rect(0, 0, 3*size.X, size.Y)) | |
for y := 0; y < size.Y; y++ { | |
for x := 0; x < size.X; x++ { | |
var yycolor, cbcolor, crcolor color.Color | |
r, g, b, _ := image_in.At(x, y).RGBA() | |
yy, cb, cr := color.RGBToYCbCr(uint8(r), uint8(g), uint8(b)) | |
yycolor = color.YCbCr{uint8(yy), 128, 128} | |
cbcolor = color.YCbCr{128, uint8(cb), 128} | |
crcolor = color.YCbCr{128, 128, uint8(cr)} | |
image_out.Set(x, y, yycolor) | |
image_out.Set(size.X+x, y, cbcolor) | |
image_out.Set(2*size.X+x, y, crcolor) | |
} | |
} | |
png.Encode(fd_out, image_out) | |
} |
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