recolor outlines

src/main.rs

@@ -7,25 +7,40 @@ use std::process;
 fn main() {
     let args: Vec<String> = env::args().collect();
 
-    if args.len() < 4 {
+    if args.len() < 5 {
         print_usage(&args[0]);
         process::exit(1);
     }
 
     let input_path = &args[1];
     let output_path = &args[2];
-    let color_input = &args[3];
+    let white_color_input = &args[3];
-    let apply_texture = args.len() > 4 && args[4].to_lowercase() == "true";
+    let black_color_input = &args[4];
+    let apply_texture = args.len() > 5 && args[5].to_lowercase() == "true";
 
-    let target_color = match parse_hex_color(color_input) {
+    let white_color = match parse_hex_color(white_color_input) {
         Ok(color) => color,
         Err(e) => {
-            eprintln!("Error: {}", e);
+            eprintln!("Error parsing white color: {}", e);
             process::exit(1);
         }
     };
 
-    match recolor_gif(input_path, output_path, target_color, apply_texture) {
+    let black_color = match parse_hex_color(black_color_input) {
+        Ok(color) => color,
+        Err(e) => {
+            eprintln!("Error parsing black color: {}", e);
+            process::exit(1);
+        }
+    };
+
+    match recolor_gif(
+        input_path,
+        output_path,
+        white_color,
+        black_color,
+        apply_texture,
+    ) {
         Ok(_) => (),
         Err(e) => {
             eprintln!("Error: {}", e);
@@ -36,19 +51,24 @@ fn main() {
 
 fn print_usage(program: &str) {
     eprintln!(
-        "Usage: {} <input.gif> <output.gif> <color> [texture]",
+        "Usage: {} <input.gif> <output.gif> <white_color> <black_color> [texture]",
         program
     );
     eprintln!();
     eprintln!("Arguments:");
-    eprintln!("  <input.gif>   Path to input GIF file");
+    eprintln!("  <input.gif>    Path to input GIF file");
-    eprintln!("  <output.gif>  Path to output GIF file");
+    eprintln!("  <output.gif>   Path to output GIF file");
-    eprintln!("  <color>       Target color in hex format (e.g., FF5733 or #FF5733)");
+    eprintln!(
-    eprintln!("  [texture]     Optional: 'true' to apply texture/noise (default: false)");
+        "  <white_color>  Target color for white pixels in hex format (e.g., FF5733 or #FF5733)"
+    );
+    eprintln!(
+        "  <black_color>  Target color for black pixels in hex format (e.g., 000000 or #000000)"
+    );
+    eprintln!("  [texture]      Optional: 'true' to apply texture/noise (default: false)");
     eprintln!();
     eprintln!("Examples:");
-    eprintln!("  {} neko.gif neko_red.gif FF0000", program);
+    eprintln!("  {} neko.gif neko_red.gif FF0000 000000", program);
-    eprintln!("  {} neko.gif neko_blue.gif 0066FF true", program);
+    eprintln!("  {} neko.gif neko_blue.gif 0066FF 330000 true", program);
 }
 
 fn parse_hex_color(hex: &str) -> Result<Rgba<u8>, String> {
@@ -67,7 +87,8 @@ fn parse_hex_color(hex: &str) -> Result<Rgba<u8>, String> {
 fn recolor_gif(
     input_path: &str,
     output_path: &str,
-    target_color: Rgba<u8>,
+    white_color: Rgba<u8>,
+    black_color: Rgba<u8>,
     apply_texture: bool,
 ) -> Result<(), Box<dyn std::error::Error>> {
     // Open and decode input GIF
@@ -94,7 +115,7 @@ fn recolor_gif(
             .ok_or("Failed to create image from frame")?;
 
         // Recolor the image
-        recolor_image(&mut img, target_color, apply_texture);
+        recolor_image(&mut img, white_color, black_color, apply_texture);
 
         // Create output frame with same timing
         let mut pixel_data = img.into_raw();
@@ -107,12 +128,23 @@ fn recolor_gif(
     Ok(())
 }
 
-fn recolor_image(img: &mut RgbaImage, target_color: Rgba<u8>, apply_texture: bool) {
+fn recolor_image(
-    // Generate color palette with variations if texture is enabled
+    img: &mut RgbaImage,
-    let color_palette = if apply_texture {
+    white_color: Rgba<u8>,
-        generate_color_palette(target_color, 7)
+    black_color: Rgba<u8>,
+    apply_texture: bool,
+) {
+    // Generate color palettes with variations if texture is enabled
+    let white_palette = if apply_texture {
+        generate_color_palette(white_color, 7)
     } else {
-        vec![target_color]
+        vec![white_color]
+    };
+
+    let black_palette = if apply_texture {
+        generate_color_palette(black_color, 7)
+    } else {
+        vec![black_color]
     };
 
     for (x, y, pixel) in img.enumerate_pixels_mut() {
@@ -128,14 +160,19 @@ fn recolor_image(img: &mut RgbaImage, target_color: Rgba<u8>, apply_texture: boo
 
         // Determine pixel type based on brightness
         if brightness < 64 {
-            // Very dark pixels (outlines) - keep original
+            // Very dark pixels (outlines) - apply black target color
-            continue;
-        } else if brightness > 200 {
-            // White/light pixels (body) - apply target color
             let chosen_color = if apply_texture {
-                pick_color_from_palette(&color_palette, x, y)
+                pick_color_from_palette(&black_palette, x, y)
             } else {
-                target_color
+                black_color
+            };
+            *pixel = chosen_color;
+        } else if brightness > 200 {
+            // White/light pixels (body) - apply white target color
+            let chosen_color = if apply_texture {
+                pick_color_from_palette(&white_palette, x, y)
+            } else {
+                white_color
             };
             *pixel = chosen_color;
         } else {
@@ -145,9 +182,9 @@ fn recolor_image(img: &mut RgbaImage, target_color: Rgba<u8>, apply_texture: boo
             let blend_factor = blend_factor.clamp(0.0, 1.0);
 
             let chosen_color = if apply_texture {
-                pick_color_from_palette(&color_palette, x, y)
+                pick_color_from_palette(&white_palette, x, y)
             } else {
-                target_color
+                white_color
             };
 
             let new_r =