Chat about the original Pixelmator.
I have a simple image with an off-white background. I would like to make that off-white background be pure white. I can use the "Replace Color" tool to select the off-white but I don't know how to them get that selected color to be set to my desired color of pure white.
It's probably easiest to do this using Edit > Select Color to select all the off-white areas then use Edit > Fill to fill them with white. If there are other off-white areas in the image, you'd be best off using the Color Selection tool to make a contiguous selection of the background, then fill that selection using Edit > Fill.