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JPEG images can't be that big; their maximum size is (2¹⁶-1)×(2¹⁶-1). (doesn't really matter) These are fundamentally different file formats, and their compression stems from different properties: Where JPEG is a lossy format who is able to drastically reduce the file size of content that has photographic properties (mostly: low-pass behaviour in 8×8 pixel ...


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Simply because the highest compression typically is significantly more CPU-intense (it tries out multiple different approaches to represent successive lines). This really shouldn't make much difference on a modern PC for saving a few images. Then again, in practice, libpng seems to be pretty slow, so this might make a difference, especially for people ...


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