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A common problem when making color adjustments is luminosity (brightness).

Here, we're making this image more red:



When we use Curves and increase Red, we're also making the image much brighter. To correct this, you can also reduce green and blue, but that's a pain.

Instead, we can increase red while maintaining luminosity. Create a curves layer, and set its blending mode to Color. Now, when we increase red, the brightness of the image stays about the same. Only changes to color are applied and not changes to luminosity.