LAYERS, CHANNELS and MASKS
There are two approaches to image editing - destructive editing that changes the pixels in the image file and non-destructive editing that changes the appearance of the image without altering the pixels. Non-destructive editing has many advantages but to do it you need an image editor that can use layers, and preferably layer masks and channels.
The tutorials linked to this page explain and explore these features of Photoshop.
The tutorials linked to this page explain and explore these features of Photoshop.
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