Funnily enough, I was thinking about this just today! I haven't tried the idea yet, but my thought was: What would happen if you saved both a sketch render and a normal render, then used the sketch render as an alpha-channel for a mask in a painting app, then applied effects to the normal render..? I dunno yet - but you are welcome to the idea.. In this case, taking the normal image and de-saturating the couours, then applying a mask and using the sketch version in the alpha channel and playing with contrast/brightness/tone etc. might be worth an experiment? Just a thought, Cheers, Diolma