LYGIA Shader Library

rgb2yiq (lygia/color/space/rgb2yiq)

Convert from linear RGB to YIQ which was the followin range. Using conversion matrices from FCC NTSC Standard (SMPTE C) https://en.wikipedia.org/wiki/YIQ

Use:

rgb2yiq(<vec3|vec4> color)

Check it on Github


#ifndef MAT_RGB2YIQ
#define MAT_RGB2YIQ
const mat3 RGB2YIQ = mat3(
    0.300,  0.5900,  0.1100, 
    0.599, -0.2773, -0.3217, 
    0.213, -0.5251,  0.3121);
#endif

#ifndef FNC_RGB2YIQ
#define FNC_RGB2YIQ
vec3 rgb2yiq(const in vec3 rgb) { return RGB2YIQ * rgb; }
vec4 rgb2yiq(const in vec4 rgb) { return vec4(rgb2yiq(rgb.rgb), rgb.a); }
#endif

Use:

<float3|float4> rgb2yiq(<float3|float4> color)

Check it on Github


#ifndef MAT_RGB2YIQ
#define MAT_RGB2YIQ
const float3x3 RGB2YIQ = float3x3(
    0.300,  0.5900,  0.1100, 
    0.599, -0.2773, -0.3217, 
    0.213, -0.5251,  0.3121);
#endif

#ifndef FNC_RGB2YIQ
#define FNC_RGB2YIQ
float3 rgb2yiq(in float3 rgb) { return mul(RGB2YIQ, rgb); }
float4 rgb2yiq(in float4 rgb) { return float4(rgb2yiq(rgb.rgb), rgb.a); }
#endif

Check it on Github


const RGB2YIQ : mat3x3<f32>  = mat3x3<f32>( 
    vec3f(0.300,  0.5900,  0.1100), 
    vec3f(0.599, -0.2773, -0.3217), 
    vec3f(0.213, -0.5251,  0.3121) );

fn rgb2yiq(rgb : vec3f) -> vec3f { return RGB2YIQ * rgb; }

Licenses

LYGIA is dual-licensed under the Prosperity License and the Patron License for sponsors and contributors.

Sponsors and contributors are automatically added to the Patron License and they can ignore the any non-commercial rule of the Prosperity Licensed software (please take a look to the exception).

It's also possible to get a permanent comercial license hook to a single and specific version of LYGIA.

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