commit 3f4abaa97dbf099454c092a2f1d88ec45c0e1553
Author: Alexander Tarasov <a.tevg@ya.ru>
Date:   Fri May 9 06:44:42 2025 +0300

    initial commit

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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..7165f36
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,31 @@
+[package]
+name = "colorgram"
+version = "0.1.0"
+edition = "2024"
+authors = ["arabian"]
+description = "Rust library that extracts colors from image. Port of colorgram.py"
+readme = "README.md"
+license = "MIT"
+homepage = "https://github.com/arabianq/colorgram-rust"
+repository = "https://github.com/arabianq/colorgram-rust"
+keywords = ["colors", "image", "extract", "colorgram"]
+
+
+[dependencies]
+image = { version = "0.25.6", features = ["default-formats"] }
+clap = { version = "4.5.37", features = ["derive"] }
+
+[lib]
+name = "colorgram"
+path = "src/lib.rs"
+
+[[bin]]
+name = "colorgram-cli"
+path = "src/main.rs"
+
+[profile.release]
+strip = true
+lto = true
+codegen-units = 1
+opt-level = "z"
+panic = "abort"
\ No newline at end of file
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..321b87b
--- /dev/null
+++ b/README.md
@@ -0,0 +1,38 @@
+# colorgram-rust
+
+---
+
+colorgram-rust is a rust program that lets you extract colors from image.
+It is a port of [colorgram.py](https://github.com/obskyr/colorgram.py) (which is itself a port
+of [colorgram.js](https://github.com/darosh/colorgram-js), so it's basically a port of a port =D)
+
+**Why?** Well, it's ~25 times faster than colorgram.py (9 ms vs 225 ms for test.png on my laptop)
+
+### Installation as CLI utility
+```bash
+cargo install colorgram
+```
+
+
+### Adding to your rust project
+```toml
+[dependencies]
+colorgram = "0.1.0"
+```
+
+
+### Usage Example (code from main.rs)
+
+```rust
+use colorgram::extract;
+
+fn main() {
+    let img_path = "test.png";
+    let colors_amount = 10;
+
+    let colors = extract(img_path, colors_amount).unwrap();
+    for color in colors {
+        println!("RGB: {} {} {} HSL: {} {} {} Proportion: {:.2}", color.rgb.r, color.rgb.g, color.rgb.b, color.hsl.h, color.hsl.s, color.hsl.l, color.proportion);
+    }
+}
+```
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..0640309
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,121 @@
+use image;
+
+pub struct Hsl {
+    pub h: u8,
+    pub s: u8,
+    pub l: u8,
+}
+
+pub struct Rgb {
+    pub r: u8,
+    pub g: u8,
+    pub b: u8,
+}
+
+pub struct Color {
+    pub rgb: Rgb,
+    pub hsl: Hsl,
+    pub proportion: f32,
+}
+
+impl Color {
+    fn new(rgb: Rgb, proportion: f32) -> Color {
+        let hsl = rgb_to_hsl(&rgb);
+        Color {
+            rgb,
+            hsl,
+            proportion,
+        }
+    }
+}
+
+fn rgb_to_hsl(rgb: &Rgb) -> Hsl {
+    let r = rgb.r as i32;
+    let g = rgb.g as i32;
+    let b = rgb.b as i32;
+
+    let most = r.max(g).max(b);
+    let least = r.min(g).min(b);
+
+    let l = (most + least) >> 1;
+
+    let (h, s) = if most == least {
+        (0, 0)
+    } else {
+        let diff = most - least;
+        let s = if l > 127 {
+            diff * 255 / (510 - most - least)
+        } else {
+            diff * 255 / (most + least)
+        };
+        let h = if most == r {
+            ((g - b) * 255 / diff + if g < b { 1530 } else { 0 }) / 6
+        } else if most == g {
+            ((b - r) * 255 / diff + 510) / 6
+        } else {
+            ((r - g) * 255 / diff + 1020) / 6
+        };
+        (h as u8, s as u8)
+    };
+
+    Hsl { h, s, l: l as u8 }
+}
+
+pub fn extract<P: AsRef<std::path::Path>>(
+    path: P,
+    number_of_color: usize,
+) -> Result<Vec<Color>, Box<dyn std::error::Error>> {
+    let img = image::open(path)?;
+    let img = img.to_rgb8();
+
+    let mut samples = vec![0u32; 4 * 4096];
+
+    for pixel in img.pixels() {
+        let rgb = Rgb {
+            r: pixel[0],
+            g: pixel[1],
+            b: pixel[2],
+        };
+        let hsl = rgb_to_hsl(&rgb);
+
+        let y_val = ((rgb.r as f32 * 0.2126 + rgb.g as f32 * 0.7152 + rgb.b as f32 * 0.0722) as u8)
+            & 0b1100_0000;
+        let h = hsl.h & 0b1100_0000;
+        let l = hsl.l & 0b1100_0000;
+
+        let packed = ((y_val as usize) << 4) | ((h as usize) << 2) | (l as usize);
+        let idx = packed * 4;
+        samples[idx] += rgb.r as u32;
+        samples[idx + 1] += rgb.g as u32;
+        samples[idx + 2] += rgb.b as u32;
+        samples[idx + 3] += 1;
+    }
+
+    let mut used = Vec::new();
+    for (_i, chunk) in samples.chunks(4).enumerate() {
+        let count = chunk[3];
+        if count > 0 {
+            let avg_r = (chunk[0] / count) as u8;
+            let avg_g = (chunk[1] / count) as u8;
+            let avg_b = (chunk[2] / count) as u8;
+            let avg_rgb = Rgb {
+                r: avg_r,
+                g: avg_g,
+                b: avg_b,
+            };
+            used.push((count, avg_rgb));
+        }
+    }
+
+    used.sort_unstable_by(|a, b| b.0.cmp(&a.0));
+
+    let top_used = &used[..number_of_color];
+    let sum_counts: u32 = top_used.iter().map(|&(count, _)| count).sum();
+
+    let mut colors = Vec::with_capacity(number_of_color);
+    for (count, rgb) in used.into_iter().take(number_of_color) {
+        colors.push(Color::new(rgb, count as f32 / sum_counts as f32));
+    }
+
+    Ok(colors)
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..26fd554
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,39 @@
+use clap::Parser;
+use colorgram::extract;
+use std::path::{PathBuf, absolute};
+
+#[derive(Parser, Debug)]
+#[command(version, about, long_about = None)]
+struct Args {
+    #[arg(short = 'i', long = "input")]
+    input_file: PathBuf,
+
+    #[arg(short = 'c', long = "colors", default_value_t = 10)]
+    colors_amount: usize,
+}
+
+fn main() {
+    let args = Args::parse();
+
+    let input_path = absolute(&args.input_file).unwrap();
+    let colors_amount = args.colors_amount;
+
+    assert!(input_path.exists(), "Input file does not exist");
+    assert!(input_path.is_file(), "Input path is not a file");
+    assert!(colors_amount > 0, "Colors amount must be greater than zero");
+
+    match extract(input_path, colors_amount) {
+        Ok(colors) => {
+            for color in colors {
+                println!(
+                    "RGB: ({}, {}, {}), Proportion: {:.2}%",
+                    color.rgb.r,
+                    color.rgb.g,
+                    color.rgb.b,
+                    color.proportion * 100.0
+                );
+            }
+        }
+        Err(e) => eprintln!("Error: {}", e),
+    }
+}
diff --git a/test.png b/test.png
new file mode 100644
index 0000000..be8ece2
Binary files /dev/null and b/test.png differ