GIF doesn't do metadata in any useful way. PNG meta data is either limited or not standardized. JPEG meta data has several formats which are not consistently supported.
A single standard that doesn't care about image format seems simpler to me.
Posted Sep 27, 2013 11:23 UTC (Fri) by petli (guest, #93051)
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The best bet for embedding metadata seems to be XMP, which allows structured, extensible data. It is supported by PNG, JPG, TIFF and PDF, at least when the tools don't strip it.
Pasting images with automatic attribution
Posted Oct 3, 2013 15:19 UTC (Thu) by Seegras (subscriber, #20463)
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> The best bet for embedding metadata seems to be XMP, which allows
> structured, extensible data. It is supported by PNG, JPG, TIFF and PDF,
> at least when the tools don't strip it.
Yes, and you should use embedded metadata. Always.
In the end, there are NOT many file formats you really need. For Images, its basically PNG, JPG, TIFF; for vectors its SVG, for (finished) Documents its PDF, DJVU and EPUB, for Music its MP3, OGM and FLAC, for Movies its MKV, and maybe MP4. Everything else can be converted.