It depends on the final size of the texture. The size of the individual sprites doesn’t matter but the width and height of the atlas/texture will be a power of two, ie 2, 4, 8, 16, 32, 64, 128, 256, 512, 2014, 2048. This means that if you put an image that is 513 pixels wide into an atlas you are guaranteed that the atlas will be at least 1024 wide, which could be vasting a huge amount of pixels and take up a lot of memory to no use.
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