lygia/color/contrast)Bias high pass
Use:
<vec4|vec3|float> contrast(<vec4|vec3|float> value, <float> amount)
#ifndef FNC_CONTRAST
#define FNC_CONTRAST
float contrast(in float v, in float a) { return (v - 0.5 ) * a + 0.5; }
vec3 contrast(in vec3 v, in float a) { return (v - 0.5 ) * a + 0.5; }
vec4 contrast(in vec4 v, in float a) { return vec4((v.rgb - 0.5 ) * a + 0.5, v.a); }
#endif
Use:
<float4|float3|float> contrast(<float4|float3|float> value, <float> amount)
#ifndef FNC_CONTRAST
#define FNC_CONTRAST
float contrast(in float value, in float amount) {
return (value - 0.5 ) * amount + 0.5;
}
float3 contrast(in float3 value, in float amount) {
return (value - 0.5 ) * amount + 0.5;
}
float4 contrast(in float4 value, in float amount) {
return float4(contrast(value.rgb, amount), value.a);
}
#endif
Use:
<float4|float3|float> contrast(<float4|float3|float> value, <float> amount)
#ifndef FNC_CONTRAST
#define FNC_CONTRAST
float contrast(float v, float a) { return (v - 0.5 ) * a + 0.5; }
float3 contrast(float3 v, float a) { return (v - 0.5 ) * a + 0.5; }
float4 contrast(float4 v, float a) { return float4((v.rgb - 0.5 ) * a + 0.5, v.a); }
#endif
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