How do I adjust colour balance without affecting black/white?

Question

How do I adjust colour balance without affecting black/white background?

Basically I have converted images into black and white or grey scale.

I would like to add 5 to 20% red to the image but I don't want to affect the black background. See example below. I'd like to keep the background the dark pure black it is.

Is masking the way forward or is there an easier way?

davescm · Accepted Answer

Another alternative for your image is a gradient map adjustment layer Dave

barbara_a7746676 · Answer

There are many ways to add a color tint, none of which should change a pure black background.

Here I added a Photo Filter adjustment layer with 25% red.

Open the Info panel. Move your cursor around the image. Putting the cursor in the black area gives a readout of pure black. Putting the cursor over any area that is lighter than pure black shows you a readout of that color. The original color is on the left. To the right of the forward slash / is the new color value.

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