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Respect a bit more the luminance in NTSC

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This commit is contained in:
Ivan Izaguirre 2020-10-04 16:10:34 +02:00
parent b0a1282b0a
commit 3c59e9f3e4
1 changed files with 15 additions and 2 deletions
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17
screenNtscFilter.go
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@ -50,6 +50,14 @@ var rgbColorMap = [16]color.Color{
func filterNTSCColor(in *image.RGBA, mask *image.Alpha) *image.RGBA {
colorMap := ntscColorMap // or rgbColorMap
attenuatedColorMap := make([]color.Color, 16, 16)
for i := 0; i < len(colorMap); i++ {
r, g, b, _ := colorMap[i].RGBA()
attenuatedColorMap[i] = color.RGBA64{
uint16(r / 2), uint16(g / 2), uint16(b / 2),
65535,
}
}
b := in.Bounds()
width := b.Dx()
@ -71,9 +79,14 @@ func filterNTSCColor(in *image.RGBA, mask *image.Alpha) *image.RGBA {
v &^= pos
}
cOut := colorMap[v]
var cOut color.Color
if r != 0 {
cOut = colorMap[v]
} else {
cOut = attenuatedColorMap[v]
}
if mask != nil {
// RGM mode7
// RGB mode7
_, _, _, a := mask.At(x, y).RGBA()
if a > 0 {
cOut = cIn