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Based on http://ftp-osl.osuosl.org/pub/libpng/documents/pngext-1.5.0.html#C.eXIf , it looks like there is a push to officially add exif support into the PNG image format , it looks like they have defined how to include EXIF data in a PNG 'data chunk' (a standard mechanism 'adding extra data' to PNG files).

Given the work EXIF-related started in #3625 (which addresses #520 ), is it reasonable to consider this feature request for Pillow?

That was poor wording on my part, I think. The PNG format 'extension' seems to be legitimate, and official. The PNG format isn't modified at all, but the 'extension' merely defines how EXIF should be included as a 'data chunk', which the format already supports.

I'll edit the original description above.