commit 1a550ca6eac0693979b0327ca7c9f2c4f1295bb7
Author: minerva-jupiter <ryouturn@gmail.com>
Date: Thu, 30 Oct 2025 19:29:18 +0900
init commit
Diffstat:
| A | .gitignore | | | 1 | + |
| A | Cargo.lock | | | 1101 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | Cargo.toml | | | 7 | +++++++ |
| A | src/main.rs | | | 137 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
4 files changed, 1246 insertions(+), 0 deletions(-)
diff --git a/.gitignore b/.gitignore
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diff --git a/Cargo.lock b/Cargo.lock
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diff --git a/Cargo.toml b/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name = "image-light-freq-conv"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+image = "0.25.8"
diff --git a/src/main.rs b/src/main.rs
@@ -0,0 +1,137 @@
+use image::{GenericImageView, DynamicImage, Rgba, Pixel, Luma};
+use std::env;
+use std::fs::File;
+use std::path::Path;
+
+fn load_image(path: &Path) -> Result<Vec<Vec<Rgba<u8>>>, image::ImageError> {
+ let img: DynamicImage = image::open(path)?;
+ let (width, height) = img.dimensions();
+
+ let mut pixel_array: Vec<Vec<Rgba<u8>>> = Vec::with_capacity(height as usize);
+ for y in 0..height {
+ let mut row: Vec<Rgba<u8>> = Vec::with_capacity(width as usize);
+ for x in 0..width {
+ let pixel: Rgba<u8> = img.get_pixel(x, y).to_rgba();
+ row.push(pixel);
+ }
+ pixel_array.push(row);
+ }
+ Ok(pixel_array)
+}
+
+const MIN_WAVELENGTH_NM: f64 = 400.0; // 紫の端
+const MAX_WAVELENGTH_NM: f64 = 700.0; // 赤の端
+const GREEN_WAVELENGTH_NM: f64 = 550.0; // 緑色の中央付近
+ //
+fn rgba_to_approx_wavelength(pixel: Rgba<u8>) -> f64 {
+ let r_u8 = pixel.0[0] as f64;
+ let g_u8 = pixel.0[1] as f64;
+ let b_u8 = pixel.0[2] as f64;
+
+ let r = r_u8 / 255.0;
+ let g = g_u8 / 255.0;
+ let b = b_u8 / 255.0;
+
+ let max = r.max(g).max(b);
+ let min = r.min(g).min(b);
+ let chroma = max - min;
+ let hue_deg; // 色相 (0.0 から 360.0 度)
+
+ if chroma == 0.0 {
+ return GREEN_WAVELENGTH_NM;
+ } else {
+ let mut h_prime = if max == r {
+ (g - b) / chroma
+ } else if max == g {
+ (b - r) / chroma + 2.0
+ } else {
+ (r - g) / chroma + 4.0
+ };
+
+ if h_prime < 0.0 {
+ h_prime += 6.0;
+ }
+
+ hue_deg = h_prime * 60.0;
+ }
+
+ let h_norm = hue_deg / 360.0;
+
+ let wavelength_nm;
+
+ if h_norm <= 1.0 / 6.0 { // 赤〜黄 (0°〜60°) : 700nm から 590nm
+ let t = h_norm * 6.0; // tは 0.0 から 1.0
+ wavelength_nm = MAX_WAVELENGTH_NM - t * (MAX_WAVELENGTH_NM - 590.0);
+ } else if h_norm <= 2.0 / 6.0 { // 黄〜緑 (60°〜120°) : 590nm から 550nm
+ let t = (h_norm - 1.0 / 6.0) * 6.0; // tは 0.0 から 1.0
+ wavelength_nm = 590.0 - t * (590.0 - GREEN_WAVELENGTH_NM);
+ } else if h_norm <= 4.0 / 6.0 { // 緑〜青 (120°〜240°) : 550nm から 450nm
+ let t = (h_norm - 2.0 / 6.0) * 3.0; // tは 0.0 から 1.0
+ wavelength_nm = GREEN_WAVELENGTH_NM - t * (GREEN_WAVELENGTH_NM - 450.0);
+ } else { // 青〜赤 (240°〜360°) : 450nm から 700nm
+
+ let t_total = h_norm - 4.0 / 6.0; // 240度 (4/6) から 1.0 までの範囲
+ let t_norm = t_total * 3.0; // t_norm は 0.0 から 1.0
+
+ wavelength_nm = 450.0 - t_norm * (450.0 - MIN_WAVELENGTH_NM);
+
+ return wavelength_nm.max(MIN_WAVELENGTH_NM).min(MAX_WAVELENGTH_NM);
+ }
+
+ wavelength_nm.max(MIN_WAVELENGTH_NM).min(MAX_WAVELENGTH_NM)
+}
+
+fn wavelength_to_grayscale(wavelength_nm: f64) -> u8 {
+ let clamped_wavelength_nm = wavelength_nm.max(MIN_WAVELENGTH_NM).min(MAX_WAVELENGTH_NM);
+
+ let range_length = MAX_WAVELENGTH_NM - MIN_WAVELENGTH_NM;
+
+ let normalized_position = (clamped_wavelength_nm - MIN_WAVELENGTH_NM) / range_length;
+
+ let grayscale_f64 = normalized_position * 255.0;
+
+ grayscale_f64.round() as u8
+}
+
+fn main() -> Result<(), Box<dyn std::error::Error>>{
+ let args: Vec<String> = env::args().collect();
+ if args.len() == 1 || args.len() > 4{
+ println!("args are not collect. use this 'image-light-freq-con <inputFilePath> <outputFilePath>'");
+ return Ok(());
+ }
+ let path = Path::new(&args[1]);
+ let pixels = match load_image(path){
+ Ok(pixels) => pixels,
+ Err(e) => {
+ println!("Could not load image. {:?}",e);
+ return Ok(());
+ }
+ };
+
+ let height = pixels.len() as u32;
+ let width = pixels[0].len() as u32;
+
+ let mut grascale_img: Vec<Vec<u8>> = Vec::with_capacity(height as usize);
+
+ for row in pixels.iter() {
+ let mut grascale_img_row: Vec<u8> = Vec::with_capacity(width as usize);
+ for pixel in row.iter() {
+ grascale_img_row.push(wavelength_to_grayscale(rgba_to_approx_wavelength(*pixel)));
+ }
+ grascale_img.push(grascale_img_row);
+ }
+
+ let grayscale_data_flat: Vec<u8> = grascale_img.into_iter()
+ .flat_map(|row| row.into_iter())
+ .collect();
+
+ let output_img = image::ImageBuffer::<Luma<u8>, _>::from_raw(width, height, grayscale_data_flat)
+ .ok_or("Failed to create image buffer")?;
+
+ let output_filename = Path::new(&args[2]);
+
+ let mut output_file = File::create(output_filename)?;
+ output_img.write_to(&mut output_file, image::ImageFormat::Png)?;
+
+ Ok(())
+}
