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0000000..013f441 --- /dev/null +++ b/Cargo.toml @@ -0,0 +1,9 @@ +[package] +name = "lut_extractor" +version = "0.1.0" +edition = "2021" + +# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html + +[dependencies] +exr = "1.4.1" diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..ce3d988 --- /dev/null +++ b/src/main.rs @@ -0,0 +1,77 @@ +const GRADIENT_LEN: usize = 1 << 16; +const TABLE_SIZE: usize = 128; +const RES_X: usize = 2048; +const RES_Y: usize = 1556; + +fn main() { + // Build the test image. + let pixels = { + let mut pixels = vec![[0.0f32; 3]; RES_X * RES_Y]; + assert!(((GRADIENT_LEN * 4) + (TABLE_SIZE * TABLE_SIZE * TABLE_SIZE)) <= pixels.len()); + + // Keep track of which pixel we're at. + let mut pi = 0; + + // Gray gradient. + for i in 0..GRADIENT_LEN { + let v = i as f32 / (GRADIENT_LEN - 1) as f32; + pixels[pi] = [v, v, v]; + pi += 1; + } + + // Red gradient. + for i in 0..GRADIENT_LEN { + let v = i as f32 / (GRADIENT_LEN - 1) as f32; + pixels[pi][0] = v; + pi += 1; + } + + // Green gradient. + for i in 0..GRADIENT_LEN { + let v = i as f32 / (GRADIENT_LEN - 1) as f32; + pixels[pi][1] = v; + pi += 1; + } + + // Blue gradient. + for i in 0..GRADIENT_LEN { + let v = i as f32 / (GRADIENT_LEN - 1) as f32; + pixels[pi][2] = v; + pi += 1; + } + + // 3D RGB table. + for r in 0..TABLE_SIZE { + let rn = r as f32 / (TABLE_SIZE - 1) as f32; + for g in 0..TABLE_SIZE { + let gn = g as f32 / (TABLE_SIZE - 1) as f32; + for b in 0..TABLE_SIZE { + let bn = b as f32 / (TABLE_SIZE - 1) as f32; + pixels[pi] = [rn, gn, bn]; + pi += 1; + } + } + } + + pixels + }; + + // Write the test image. + use exr::{ + image::{Encoding, Image, Layer, SpecificChannels}, + meta::header::LayerAttributes, + prelude::WritableImage, + }; + Image::from_layer(Layer::new( + (1920, 1080), + LayerAttributes::named(""), + Encoding::SMALL_LOSSLESS, + SpecificChannels::rgb(|co: exr::math::Vec2| { + let rgb = pixels[co.1 * RES_X + co.0]; + (rgb[0], rgb[1], rgb[2]) + }), + )) + .write() + .to_file("lut_extractor_2048x1556.exr") + .unwrap(); +}