I am rather new to Photoshop, and I am currently running Photoshop CS3 on my machine. I have an image of a button that is basically black and white with shades of grey. The button image uses the shading to create a sort of three dimensional effect. I would like to change the white background to a red background, maintaining the 3D effect of the shading.
Does anyone know if a formula exists to transpose hexidecimal rgb values for shades of grey to similar values, but for shades of a color?