I'm trying to figure out a formula for determining how big an animation's file size would be, either with or without alpha channels. I'm working with pretty small png sequences (like 16x16 and 8x8 pixels). I need to determine what the file size would be so that I can figure out how many frames of animation that I can use.
I think the basics are: your intro chunks, plus outtro chunks, plus frame size times color depth times number of frames divided by relevant compression equals bits. Divide by 8 for bytes, then 1024 for kB, etc.