Photoshop’s Color Range command is great for selecting particular colours in your image — for example, all the reds, or all the greens. You can then work on these specific colours — turning them from green to red, for example, or removing particular colours from the image.
This command doesn’t work well for selecting particular areas of your image (such as a foreground object), as it has a tendency to only partially select pixels, and often selects unwanted parts of your image that are a similar colour. But it’s great for selecting colours to work on!
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