Quote:
Originally Posted by Jellby
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The only advantage I see in GIF is that it is supported by the old Mobipocket format, whereas PNG is not... but if you are converting from ePub to Mobipocket, the converter will convert from PNG to GIF too.
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... that or it will convert the PNG to a JPEG.
One BIG CAUTION with PNG. It is an extremely plastic format that has many many variants and options, many of which are poorly supported by a large number of apps. It also supports custom ancillary data. This later ability can result in massive PNGs depending on the tool used to create them and the save/export method and options chosen.
If you know your conversion tool's options and choose wisely, PNG can be an excellent option. It's not a magic format and the conversion tools won't automagically create the best flavor of PNG for your use. When using a tool like Adobe (nee Macromedia) Fireworks which uses PNG as its native format and using its "Save..." option yields a very poor PNG for use in ePubs or for direct web use. Always use and "Export ..." functions and choose the flavor of PNG (lossy compressed, lossless, 24bit RGB color, CMYK color, indexed color, ...) that is appropriate for the particular image and its use.