diff options
Diffstat (limited to 'sixel.go')
| -rw-r--r-- | sixel.go | 8 |
1 files changed, 5 insertions, 3 deletions
@@ -81,14 +81,16 @@ func avgPaletteRGB(buckets [][]color.RGBA) []sixelRGB { } func medianCut(img image.Image) color.Palette { - colors := make([]color.RGBA, 0, img.Bounds().Dx()*img.Bounds().Dy()) + var colors []color.RGBA for y := img.Bounds().Min.Y; y < img.Bounds().Max.Y; y++ { for x := img.Bounds().Min.X; x < img.Bounds().Max.X; x++ { r, g, b, a := img.At(x, y).RGBA() - colors = append(colors, color.RGBA{R: uint8(r >> 8), G: uint8(g >> 8), B: uint8(b >> 8), A: uint8(a >> 8)}) + if a > 0 { + colors = append(colors, color.RGBA{R: uint8(r >> 8), G: uint8(g >> 8), B: uint8(b >> 8), A: 0xff}) + } } } - buckets := slices.DeleteFunc(cutDepth(colors, 0), func(c []color.RGBA) bool { return len(c) == 0 }) + buckets := slices.DeleteFunc(cutDepth(colors, 0), func(b []color.RGBA) bool { return len(b) == 0 }) paletteRGB := avgPaletteRGB(buckets) if len(paletteRGB) == 256 { lastBucket := buckets[len(buckets)-1] |