I do a lot of masking, carefully following the outline of an object I want to superimpose onto a different background, or change the colour of, etc, but it's very difficult to control the mouse accurately. You end up with a really aching hand because you are holding the mouse so tightly as you try to move a mask point 0.1 of a millimetre. Is there some way to move the mask point more easily and accurately using a tool with much bigger movements?
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