EXIF viewer

[johnnychen94]

A shortcut might be to write another julia wrapper for https://github.com/libexif/libexif. I'm not sure whether LGPL license will be an issue, can we license the wrapper package, say, EXIFViewer.jl, with MIT license?

[timholy]

I think so, but the folks at BinaryBuilder would surely be able to give you a more authoritative answer.

Since EXIF seems derived from TIFF, I suspect we could also do this in native Julia by leveraging our amazing TiffImages.jl. (CC @tlnagy)

[johnnychen94]

Since EXIF seems derived from TIFF, I suspect we could also do this in native Julia by leveraging our amazing TiffImages.jl.

Not exactly as far as I could tell; EXIF metadata can be obtained in JPEG (not JPEG 2000), TIFF, and also PNG according to https://en.wikipedia.org/wiki/Exif. But having each IO background to support its own format via something like exif_open(filename) do ... end and aggregating the functionalities in ImageIO sounds like also a good solution.

I have little knowledge (or interest, or time) in photographic images so I leave this as a GSoC project in JuliaLang/www.julialang.org#1532 in case there are brave new mind who wants to explore this.

[tlnagy]

Since EXIF seems derived from TIFF, I suspect we could also do this in native Julia by leveraging our amazing TiffImages.jl. (CC @tlnagy)

This is my understanding as well, but I'm no expert on EXIF. Looks like you could re-use a lot of the architecture from TiffImages.jl since EXIF follows the same logic. Maybe some of the tag-handling infrastructure in TiffImages.jl could be pulled into a new package that both TiffImages.jl and EXIFIO.jl could import and use?

EDIT: Looks like I already have a bunch of EXIF tags supported in TiffImages.jl: https://tamasnagy.com/TiffImages.jl/stable/lib/extend/tags/