I have this image of colored blocks:
They all have different colors, but the constant is that there is a "lightning" effect that makes some sides darker or lighter than others.
How can I make a new block based on one of these, but white (while still keeping darker sides, so different shades of white)?
I have tried playing with the hue-saturation tool, but I never obtain a nice color comparable to the initial ones, I get weird combinations of colors, or it is very bright or with bad contrast. Same with the curves tool.
I'm actually unsure on how to play with the available colors in these tools, to obtain a nice white! (Ideally I'd be interested in being able to do that for any color, but let's go with white for the moment).