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support png EXIF #59

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leslie-wang opened this issue Jul 8, 2018 · 2 comments

leslie-wang commented Jul 8, 2018

Thanks for making such a useful library. seems like currently it mainly supports JPG. Just wonder if you have any plan to support PNG. such as https://superuser.com/questions/219642/what-software-can-i-use-to-read-png-metadata

Owner

rwcarlsen commented Jul 9, 2018

It would certainly be handy, but it appears that png meta data is not actually EXIF-based (https://stackoverflow.com/questions/9542359/does-png-contain-exif-data-like-jpg). So I'm not sure the goexif package is the best location for it. Either way - I won't have time to work on it myself in the near/medium term.

keithwoelke commented Jun 18, 2019

It seems like PNG includes an EXIF block since 2017: http://ftp-osl.osuosl.org/pub/libpng/documents/pngext-1.5.0.html#C.eXIf

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