Feisty2. Thank you for the quick response. I pride myself on self-sufficiency, but I can't find supportive documentation and am definitely misunderstanding something. I have Masktools2 for AviSynth 2.5.8 (I must use 2.5.8 due to other legacy filters). For simplicity, let's assume I have a one frame planar file in the variable SOURCE. What would be the actual lines of code to set every pixel with a Y below 32 to pure black?
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