I have this image:
and I want to change it so it looks gray instead of black. My problem is that it has some anti-aliasing, so there are some half-transparent and/or gray pixels on some borders. If I select everything that's black and change it to gray, those pixels end up being much darker than what they should be. And if I was trying to switch to another color, like red, it wouldn't work at all.
This is something I find myself needing quite often, so I'd like to learn how to do it. What's the conceptual way of doing it? and/or how do I do it with Pixelmator?