I need to generate a sprite sheet with squared sprite for a 2D game. How can I generate a sprite sheet where each frame has x = y? The only think I have to do is to "insert" some blank space between sprites (in case y were > x in the original sprite). Is there any program that I can use to trasform "irregular" sprite sheets to "squared" sprite sheets?
An example of non-squared sprite sheet: http://spriters-resource.com/gameboy_advance/khcom/sheet/1138