lygia/color/levels/gamma)Color gamma correction similar to Levels adjusment in Photoshop Adapted from Romain Dura (http://mouaif.wordpress.com/?p=94)
Use:
levelsGamma(<vec3|vec4> color, <float|vec3> gamma)
#ifndef FNC_GAMMA
#define FNC_GAMMA
vec3 levelsGamma(in vec3 v, in vec3 g) { return pow(v, 1.0 / g); }
vec3 levelsGamma(in vec3 v, in float g) { return levelsGamma(v, vec3(g)); }
vec4 levelsGamma(in vec4 v, in vec3 g) { return vec4(levelsGamma(v.rgb, g), v.a); }
vec4 levelsGamma(in vec4 v, in float g) { return vec4(levelsGamma(v.rgb, g), v.a); }
#endif
Use:
levelsGamma(<float3|float4> color, <float|float3> gamma)
#ifndef FNC_GAMMA
#define FNC_GAMMA
float3 levelsGamma(in float3 color, in float3 gammaAmount) {
return pow(color, 1. / gammaAmount);
}
float3 levelsGamma(in float3 color, in float gammaAmount) {
return levelsGamma(color, float3(gammaAmount, gammaAmount, gammaAmount));
}
float4 levelsGamma(in float4 color, in float3 gammaAmount) {
return float4(levelsGamma(color.rgb, gammaAmount), color.a);
}
float4 levelsGamma(in float4 color, in float gammaAmount) {
return float4(levelsGamma(color.rgb, gammaAmount), color.a);
}
#endif
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