karx/theme-rs
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Apply gamma linearization

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This commit is contained in:
Yash Karandikar 2023-06-18 23:35:33 -05:00
parent 0a20a35e4f
commit e05a22145d
2 changed files with 11 additions and 3 deletions
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14
src/main.rs
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@ -80,9 +80,17 @@ fn euclidean_distance(color1: (u8, u8, u8), color2: (u8, u8, u8)) -> f32 {
fn rgb_to_xyz((r, g, b): (u8, u8, u8)) -> (f32, f32, f32) {
// from: https://www.image-engineering.de/library/technotes/958-how-to-convert-between-srgb-and-ciexyz
let sr = r as f32 / 255.0;
let sg = g as f32 / 255.0;
let sb = b as f32 / 255.0;
let gamma = |v: f32| {
if v < 0.04045 {
v / 12.92
} else {
((v + 0.055) / 1.055).powf(2.4)
}
};
let sr = gamma(r as f32 / 255.0);
let sg = gamma(g as f32 / 255.0);
let sb = gamma(b as f32 / 255.0);
let x = (0.4124564 * sr) + (0.3575761 * sg) + (0.1804375 * sb);
let y = (0.2126729 * sr) + (0.7151522 * sg) + (0.0721750 * sb);