Description
An example of how to use hue shifting and the cross-channel adjustment filter to turn an arbitrary color into a clipping mask in Krita. In this case, we have turned green into red, then made red the alpha value, which means that areas that are green in the image are opaque, and areas that are less green are transparent. By doing this to a clone of the image, then using the result as a mask of the image itself, we can reveal the pattern underneath on areas of the image that aren't green enough, meaning that areas that were either red or blue in the original image are replaced by the pattern.