Hello, as "Nokia UI API Programmer's Guide" says putting small .png images to a large image file can save space, but I found in the Nokia game examples, seems they didn't use this way to save the space for images.
Is it a good idea to store small images in a big .png file?
but also other developers they didn't use this way in developing their games, I couldn't find a game that it used only a big image file instead of small image files, so I'm quite confused if I should store small images into a big image file in my game.
The tradeoff here is that using one big image, or filmstrip, will make your jar smaller (because one big image uses less memory than many small ones); but it will make your game a little slower and maybe (depending on the implementation) it will need more runtime memory. If your jar isn't too big, then stay with the small image approach since it's more effective. If you need the jar space then you can use the big image approach.