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Table 1 Image sizes for PubChem Compound CID 2244 as a function of image format.

From: The PubChem chemical structure sketcher

Format Anti-aliased Drawing Byte count
24-bit true color PNG yes 8 511
8-bit colormap GIF, dithered yes 3 778
8-bit colormap GIF, color reduced yes 4 689
8-bit colormap PNG, color reduced yes 4 254
8-bit colormap GIF, original colormap no 2 151
8-bit colormap PNG, original colormap no 1 733