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Using the Add and Subtract modes

Using the Add and Subtract modes: Photoshop: Channels and Masks
Using the Add and Subtract modes: Photoshop: Channels and Masks

The Calculations command provides two blend modes that are of particular use when masking: Add and Subtract. Each relies on actual luminance levels numbers, from 0 for black to 255 to white. They also include an Offset value, which allows you to add or subtract luminance; as well as a Scale value, which divides the result by as little as 1 and as much as 2.

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Skill Level Intermediate
7h 37m
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Skills covered in this course
Masking + Compositing Photography Photoshop

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