I'm trying to edit the color balance of a layer in a .xcf image, and none of the color commands do anything. For example, I can crank saturation and value to 0 in Hue-Saturation, or invert values, and the layer is unaltered (both in the preview and also after I hit OK). In fact, the the log of recent actions doesn't show me doing anything when I use a color command. I checked that the image is in RGB mode and tried different layers - nothing. I have changed the color balance in layers in this same image before. Anyone know why this should be?
Two reasons come to my mind:
Your selected layer is not the one that you want to change. (That would be the typical error if I was you. I always get confused by what layer or mask I am currently working on)
An additional layer, higher on the stack of layers, with 100% opacity will simply hide the changes that you to to any of the layers beneath.