Stack despill that runs Keylight on plate_denoise, merges the result in CIE-LCH, and writes plate_despill back onto the main stream.
Despill is a stack ToolSet for removing spill from a plate. It reads the plate_denoise layer, processes that RGB through Keylight, and stores the cleaned result on plate_despill before copying those channels onto the incoming stream.
Keylight is set up for a blue-leaning screen colour with screen balance and soft-colour replace. The Keylight output is combined with the pre-Keylight plate_denoise branch inside mergeAlt, which converts both inputs to CIE-LCH, shuffles the L channel, and converts back so the despill sits in a luminance-aware colour merge rather than a straight RGB replace.
Use it when you already carry a plate_denoise layer and want a despill pass written to plate_despill without rebuilding that graph by hand. The main pipe is preserved; only the plate_despill channels are copied on at the end.