I have a small image file (a .gif file containing ) with a transparent background and some small red squares in the foreground. I would like to change the foreground colour from red to blue (RGB 0, 0, 255).
I've managed to select the red squares using 'select by colour':
but I can't figure out how to use the fill bucket to colour them blue. When I hold the fill bucket cursor over the red squares, it displays the cursor which indicates I can apply the foreground colour, but when I click, nothing happens.
I'm missing something obvious. What is it?
51 Answer
Looking at your window title, you are working in "indexed colour" mode, which means your file has a limited colour palette. This saves space, and is why these files take very little memory to load.
If you want to edit the file, with all colours available, you should first switch to RGB mode, else the colour simply isn't available in your file :)
