I have an animation that is split up in ~20 individual images that I use for a mobile game. The game engine I use will take all the individual images and compile them into a sprite sheet for me.
My issue is that some of the frames in the animation have a lot of blank space (its an explosion so it gets bigger every frame) and I would like to crop them to save memory usage and eventually resize all of the images.
When I cropped all 20 by hand in photoshop and using the align vertical and horizontal features it really did not keep a center point for the explosion. This caused the animation to look horrible when the game engine ran through all the images. I am assuming it is because the images did not share that center point anymore since I pretty much cropped by hand.
How can I crop all of these individual images while keeping a main center point? Do I need to use a different program besides photoshop?