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Image output now does proper sRGB correction.

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This commit is contained in:
Nathan Vegdahl 2016-01-02 23:21:42 -08:00
parent a14a93f5a1
commit d7f6142749
1 changed files with 23 additions and 6 deletions
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29
src/renderer.rs
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@ -69,14 +69,14 @@ impl Renderer {
g += v;
b += (1.0 - u - v).max(0.0);
} else {
r += 0.1;
g += 0.1;
b += 0.1;
r += 0.02;
g += 0.02;
b += 0.02;
}
}
r *= 255.0 / self.spp as f32;
g *= 255.0 / self.spp as f32;
b *= 255.0 / self.spp as f32;
r = 255.0 * sRGB_gamma(r / self.spp as f32);
g = 255.0 * sRGB_gamma(g / self.spp as f32);
b = 255.0 * sRGB_gamma(b / self.spp as f32);
// Set pixel color
img.set(x, y, (r as u8, g as u8, b as u8));
@ -100,3 +100,20 @@ fn hash_u32(n: u32, seed: u32) -> u32 {
return hash;
}
fn sRGB_gamma(n: f32) -> f32 {
if n < 0.0031308 {
n * 12.92
} else {
(1.055 * n.powf(1.0 / 2.4)) - 0.055
}
}
fn sRGB_inv_gamma(n: f32) -> f32 {
if n < 0.04045 {
n / 12.92
} else {
((n + 0.055) / 1.055).powf(2.4)
}
}