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Initialize repository: a small palette test

main
Emi Simpson 6 months ago
commit
68c74ab234
Signed by: Emi
GPG Key ID: A12F2C2FFDC3D847
  1. 8
      .editorconfig
  2. 1
      .gitignore
  3. 338
      Cargo.lock
  4. 10
      Cargo.toml
  5. 14
      src/main.rs
  6. 91
      src/palette.rs

8
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1
.gitignore vendored

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/target

338
Cargo.lock generated

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Cargo.toml

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14
src/main.rs

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mod palette;
fn main() {
let image = image::open("image.png")
.expect("Failed to open image");
let colors = palette::Palette::generate(image);
println!("Dominant color: {:?}", colors.dominant_color());
println!("All colors:");
for color in &colors.raw_colors {
println!("\t{:?}", color);
}
}

91
src/palette.rs

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use image::Rgb;
use exoquant::ditherer::FloydSteinberg;
use exoquant::Remapper;
use exoquant::optimizer::WeightedKMeans;
use exoquant::generate_palette;
use exoquant::SimpleColorSpace;
use image::DynamicImage;
use image::GenericImageView;
use exoquant::Color;
const MAX_SIZE_PIXELS: u32 = 160_000;
const RESIZE_TARGET_PIXELS: f32 = 90_000.;
const NUM_COLORS: usize = 1;
pub struct Palette {
pub raw_colors: [Rgb<u8>; NUM_COLORS],
color_frequencies: [usize; NUM_COLORS],
}
impl Palette {
pub fn generate(img: DynamicImage) -> Self {
// Scale the image down if it's too big
let thumb = if img.width() * img.height() > MAX_SIZE_PIXELS {
let w = img.width() as f32;
let h = img.height() as f32;
let ratio = w / h;
let new_width = (ratio * RESIZE_TARGET_PIXELS).sqrt();
let new_height = RESIZE_TARGET_PIXELS / new_width;
img.thumbnail(new_width as u32, new_height as u32)
} else {
img
};
// Convert to exoquant image
let width = thumb.width();
let exo_img: Vec<Color> = thumb.into_rgb8()
.pixels()
.map(|p| Color {r: p[0], g: p[1], b: p[2], a: 255})
.collect();
// Generate histogram
let histogram = exo_img.iter().cloned().collect();
// Generate raw palette
let colorspace = SimpleColorSpace::default();
let palette = generate_palette(
&histogram,
&colorspace,
&WeightedKMeans,
NUM_COLORS,
);
// Quantize the image & count the frequency of each color
let ditherer = FloydSteinberg::new();
let remapper = Remapper::new(&palette, &colorspace, &ditherer);
let remapped = remapper.remap_iter(
Box::new(exo_img.into_iter()),
width as usize,
);
let color_counts = remapped.fold([0; NUM_COLORS], |mut counts, pixel| {
counts[pixel as usize] += 1;
counts
});
// Convert to a more comfortable image::Rgba color format
let palette: Vec<Rgb<u8>> = palette.into_iter()
.map(|c| Rgb([c.r, c.g, c.b]))
.collect();
let palette: [Rgb<u8>; NUM_COLORS] = palette.try_into().unwrap();
Self {
raw_colors: palette,
color_frequencies: color_counts,
}
}
pub fn dominant_color(&self) -> &Rgb<u8> {
let max_index = self.color_frequencies
.iter()
.enumerate()
.max_by_key(|(_i, count)| *count)
.unwrap()
.0;
return &self.raw_colors[max_index];
}
}
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