Simplify specifying colors

datasets/raise/extract_noise.py

@@ -15,9 +15,8 @@ imagesFolderPathFileName = imagesFolderPath.replace('/', '_')
 denoiser = 'bilateral'
 
 raiseNotFlatFields = False
-singleColorChannels = []
-
-colors = singleColorChannels or Color
+# `[Color.RED, Color.GREEN_RIGHT, ...]` or `Color`.
+colors = Color
 
 denoise = getattr(skimage.restoration, f'denoise_{denoiser}')