message: Add function to test specific cymk values.
diff: @@ -158,5 +158,20 @@ mod tests {
  }
  }
  }
  +
  + fn single_pix_correct(cymk_pix: [u8; 4], rgb_pix_true: [u8; 3]) {
  + let rgb_pix = cmyk_to_rgb(&cymk_pix);
  + assert_eq!(rgb_pix[0], rgb_pix_true[0]);
  + assert_eq!(rgb_pix[1], rgb_pix_true[1]);
  + assert_eq!(rgb_pix[2], rgb_pix_true[2]);
  + }
  +
  + #[test]
  + fn test_grey_colors() {
  + single_pix_correct([0, 0, 0, 0], [255, 255, 255]);
  + single_pix_correct([0, 0, 0, 254], [1, 1, 1]);
  + single_pix_correct([0, 0, 0, 253], [2, 2, 2]);
  + }
  +
  }
  