I apologize if this question has been answered already, I'm not experienced with Photoshop and not sure what to search for. I'm using CS4. I have a grid made up of different layers, basically like a checkers or chess board, where each square is a different layer. I've decided to change the color of some of the squares. I'm trying to find the best way to do this.
It seems I can do this by setting tolerance to 0 on Paint Bucket, since my squares are monocolor. However, in the future they might not be. Is there another way to do this, besides selecting exactly the right pixels first?
I saw a suggestion that I can "lock" the layer pixels so that transparent pixels aren't overwritten. However, the options are not available in my Photoshop version.