If you're trying to use an actual *brush* and not a texture, and are making the brush yourself, you could try taking the image and inverting it first before you make your brush. I'll use one of my quick lights for example:
This is the light texture.
When it is desaturated, it looks like this:
Making that into a brush, if I paint it on a white background, I get this (the blue represents where all the light would be):
Buuuuut that's not what I want, the color/light is on the wrong side. So I go back to my brush and invert (Ctrl + I) that image and making another brush.
Now going back, I reapply the brush and get this (once again the blue represents where all the light would be):
It gives a completely different effect. While I know my images aren't exactly the best for examples, you can definitely go try it yourself with your own images ^_^
That may or may not have been what you wanted to do, but at least now you can make two separate brushes for a light texture and use them differently. Hope that helped a little.
This is the light texture.
When it is desaturated, it looks like this:
Making that into a brush, if I paint it on a white background, I get this (the blue represents where all the light would be):
Buuuuut that's not what I want, the color/light is on the wrong side. So I go back to my brush and invert (Ctrl + I) that image and making another brush.
Now going back, I reapply the brush and get this (once again the blue represents where all the light would be):
It gives a completely different effect. While I know my images aren't exactly the best for examples, you can definitely go try it yourself with your own images ^_^
That may or may not have been what you wanted to do, but at least now you can make two separate brushes for a light texture and use them differently. Hope that helped a little.
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