Learn the difference between Opacity and Flow. This easy trick will help you remember it. See examples on how to use it best. A simple Dodge and Burn trick. The reason why I use opacity for masks. Also: Why to use 16 bit images to avoid Banding.
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Dodge & Burn Video: https://www.youtube.com/watch?v=_qBVSqTqpmA
Mask like a PRO: https://www.youtube.com/watch?v=uUIJvbBaWjY