message: Update src/imageops/colorops.rs
diff: @@ -56,7 +56,7 @@ where
  let (width, height) = image.dimensions();
  let mut out = ImageBuffer::new(width, height);
  - for pixel in image.pixels() {
  + for (x, y, color) in image.pixels() {
  let grayscale = pixel.2.to_luma_alpha();
  let new_pixel = grayscale.into_color(); // no-op for luma->luma
  