lygia/color/space/lms2rgb)Convert LST to RGB. LMS (long, medium, short), is a color space which represents the response of the three types of cones of the human eye, named for their responsivity (sensitivity) peaks at long, medium, and short wavelengths. Refs https://en.wikipedia.org/wiki/LMS_color_space https://arxiv.org/pdf/1711.10662
Use:
<vec3\vec4> lms2rgb(<vec3|vec4> lms)
#ifndef MAT_LMS2RGB
#define MAT_LMS2RGB
// const mat3 LMS2RGB = mat3(
// 2.85847e+0, -1.62879e+0, -2.48910e-2,
// -2.10182e-1, 1.15820e+0, 3.24281e-4,
// -4.18120e-2, -1.18169e-1, 1.06867e+0
// );
const mat3 LMS2RGB = mat3(
0.0809444479, -0.0102485335, -0.000365296938,
-0.13050440, 0.0540193266, -0.00412161469,
0.116721066, -0.113614708, 0.693511405
);
#endif
#ifndef FNC_LMS2RGB
#define FNC_LMS2RGB
vec3 lms2rgb(const in vec3 lms) { return LMS2RGB * lms; }
vec4 lms2rgb(const in vec4 lms) { return vec4( lms2rgb(lms.xyz), lms.a ); }
#endif
Use:
<float3\float4> lms2rgb(<float3|float4> lms)
#ifndef MAT_LMS2RGB
#define MAT_LMS2RGB
// const float3x3 LMS2RGB = float3x3(
// 2.85847e+0, -1.62879e+0, -2.48910e-2,
// -2.10182e-1, 1.15820e+0, 3.24281e-4,
// -4.18120e-2, -1.18169e-1, 1.06867e+0
// );
const float3x3 LMS2RGB = float3x3(
0.0809444479, -0.0102485335, -0.000365296938,
-0.13050440, 0.0540193266, -0.00412161469,
0.116721066, -0.113614708, 0.693511405
);
#endif
#ifndef FNC_LMS2RGB
#define FNC_LMS2RGB
float3 lms2rgb(float3 lms) { return mul(LMS2RGB, lms); }
float4 lms2rgb(float4 lms) { return float4( lms2rgb(lms.xyz), lms.a ); }
#endif
// const LMS2RGB = mat3x3<f32>(
// vec3f(2.85847e+0, -1.62879e+0, -2.48910e-2),
// vec3f(-2.10182e-1, 1.15820e+0, 3.24281e-4),
// vec3f(-4.18120e-2, -1.18169e-1, 1.06867e+0)
// );
const LMS2RGB = mat3x3<f32>(
vec3f( 0.0809444479, -0.0102485335, -0.000365296938),
vec3f(-0.13050440, 0.0540193266, -0.00412161469),
vec3f( 0.116721066, -0.113614708, 0.693511405)
);
fn lms2rgb(lms : vec3f) -> vec3f { return LMS2RGB * lms; }
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