I am attempting to create a color-coded grid diagram for a cross-stitch pattern. As shown in the attached image (sorry it is a little blurry, this is just my test run), I have a white "background" layer, a "symbols" layer with the pattern showing the symbols of the pattern for each square, a "grid" layer with a blank grid used to control where the color via bucket fill will go), and a transparent "colors" layer that I am using to bucket fill the appropriate colors in each square (specific to the symbol shown on the symbols layer). In this fashion, I will have a layer for the blank grid as well as a layer for the colors. When doing the bucket fill, I will be using the "sample merged" feature since I only want a single square to be filled with each color (based off of the grid layer). However, here is where is run into a problem. With the "sample merged" feature on, GIMP of course will look at the symbols layer as well, and not just fill in the grid layer with a color. So, at this point, all I have been able to figure out is that I would need to make the symbols layer invisible before adding the color. But I need to see the symbol layer to know which color to put in each square! Toggling the visibility of the symbol layer would be exceeding tedious and time consuming (as there are approximately 65,000 squares on this one pattern alone. If this is the only way to do it, then so be it...but I was hoping someone out there knew of a way to make the symbols layer visible to me, but not to GIMP...sort of a selective "sample merged" option?