Single post in (Spoilers)(13+) Space Flareon Gets into Yet Another Fandom

Lock alpha is a godsend. Already have stuff colored in, but want to change something without worrying about going outside the lines? Check the lock alpha box and you can change the color without worrying about accidentally coloring outside the lines. Just remember to turn it off when you want to ADD color instead of replace an existing one on the layer. Lock alpha is good for coloring lines that have already been drawn, or changing a colored area to a different color on the coloring layer. Editable artpieces often have the color layer be gray, and then tell others to use lock alpha to color them in.