I have a lot of designs where I have created multiple versions in different colors, and often this requires swapping out an image for one that's a different color. Generally, this is pretty easy because I can use the replace image function and everything will align perfectly. But on occasion, I need to crop an image in order to make it work with the design, and in that case the replace function doesn't work so well. The replacement image isn't cropped so the alignment is all off. I have to crop it by hand, and the cropping tool doesn't give you any way to be precise, you just have to eyeball it. So, it's virtually impossible to get it lined up perfectly so that the color grouping function will recognize it as just a different color of the same image.
