LYGIA Shader Library

Use:

rgb2YCbCr(<vec3|vec4> color)

Check it on Github

#ifndef FNC_RGB2YCBCR
#define FNC_RGB2YCBCR
vec3 rgb2YCbCr(const in vec3 rgb){
    float y = dot(rgb, vec3(0.299, 0.587, 0.114));
    float cb = .5 + dot(rgb, vec3(-0.168736, -0.331264, 0.5));
    float cr = .5 + dot(rgb, vec3(0.5, -0.418688, -0.081312));
    return vec3(y, cb, cr);
}

vec4 rgb2YCbCr(const in vec4 rgb) {
    return vec4(rgb2YCbCr(rgb.rgb),rgb.a);
}
#endif

Use:

rgb2YCbCr(<float3|float4> color)

Check it on Github

#ifndef FNC_RGB2YCBCR
#define FNC_RGB2YCBCR
float3 rgb2YCbCr(in float3 rgb){
    float y = dot(rgb, float3(.299, .587, .114));
    float cb = .5 + dot(rgb, float3(-.168736, -.331264, .5));
    float cr = .5 + dot(rgb, float3(.5, -.418688, -.081312));
    return float3(y, cb, cr);
}

float4 rgb2YCbCr(in float4 rgb) {
    return float4(rgb2YCbCr(rgb.rgb),rgb.a);
}
#endif

Check it on Github

fn rgb2YCbCr(rgb: vec3f) -> vec3f {
    let y = dot(rgb, vec3f(0.299, 0.587, 0.114));
    let cb = 0.5 + dot(rgb, vec3f(-0.168736, -0.331264, 0.5));
    let cr = 0.5 + dot(rgb, vec3f(0.5, -0.418688, -0.081312));
    return vec3f(y, cb, cr);
}