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public:oklab [2025/08/23 06:08] – created affinepublic:oklab [2025/08/24 11:22] (current) – affine
Line 5: Line 5:
 https://bottosson.github.io/posts/oklab https://bottosson.github.io/posts/oklab
  
 +<code>
 +struct Lab {float L; float a; float b;};
 +struct RGB {float r; float g; float b;};
 +
 +Lab linear_srgb_to_oklab(RGB c) 
 +{
 +    float l = 0.4122214708f * c.r + 0.5363325363f * c.g + 0.0514459929f * c.b;
 + float m = 0.2119034982f * c.r + 0.6806995451f * c.g + 0.1073969566f * c.b;
 + float s = 0.0883024619f * c.r + 0.2817188376f * c.g + 0.6299787005f * c.b;
 +
 +    float l_ = cbrtf(l);
 +    float m_ = cbrtf(m);
 +    float s_ = cbrtf(s);
 +
 +    return {
 +        0.2104542553f*l_ + 0.7936177850f*m_ - 0.0040720468f*s_,
 +        1.9779984951f*l_ - 2.4285922050f*m_ + 0.4505937099f*s_,
 +        0.0259040371f*l_ + 0.7827717662f*m_ - 0.8086757660f*s_,
 +    };
 +}
 +
 +RGB oklab_to_linear_srgb(Lab c) 
 +{
 +    float l_ = c.L + 0.3963377774f * c.a + 0.2158037573f * c.b;
 +    float m_ = c.L - 0.1055613458f * c.a - 0.0638541728f * c.b;
 +    float s_ = c.L - 0.0894841775f * c.a - 1.2914855480f * c.b;
 +
 +    float l = l_*l_*l_;
 +    float m = m_*m_*m_;
 +    float s = s_*s_*s_;
 +
 +    return {
 + +4.0767416621f * l - 3.3077115913f * m + 0.2309699292f * s,
 + -1.2684380046f * l + 2.6097574011f * m - 0.3413193965f * s,
 + -0.0041960863f * l - 0.7034186147f * m + 1.7076147010f * s,
 +    };
 +}
 +</code>
public/oklab.txt · Last modified: by affine