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https://liveclasses.ru/course/graphics/trichromatic_masks/

This is one of the most important topics related to hands-on processing. How to assemble a mask using information that is already in the image? How to choose a sequence of operations? What to do first: mask or correction? What are the pros and cons of each option? We will talk in detail about the formation of good habits that will always lead to good results and help save time. How? Save money by not manually painting the mask from scratch, but by finding a blank for it in the channels. Save during manual refinement, due to the correct selection of tools and their settings, which allows you to make less accurate and more sweeping strokes. Save by folding the mask from several blanks, using all the contrasts between the objects, rather than enhancing them by hand drawing.