Support JP2 files

[ovanderzee]

Did you consider support for JP2 files? These are web-useable in Safari and are popular for scientific purposes.

[MikeKovarik]

Hello. I don't even know that this format exists, let alone how it works. So unfortunately I don't plan on supporting it any time soon. But I'm open to PR and I'd be happy to provide guidance if you'd like to implement it. For now I'm only planning to implement PNG and WebP.

[ovanderzee]

JPEG2000 a lossless flavor of JPEG. Since you already support that, i thought it might be easy.

[MikeKovarik]

Oh, yeah jpeg200 rings a bell. I just didn't realize the connection with Jp2. Do you have some files that you could upload here for me to work with? I can take a look at that.

[ovanderzee]

jp2-examples.zip

[MikeKovarik]

Thank you. from the quick look I could tell that the file structure is ISOBMFF based, the same structure used in HEIC which exifr already supports. There are some ICC data (rTRC, bTRC, gXYZ and others) and then there's some XMP matching the png's that you provided.

So adding support for jp2 is certainly possible. Unfortunately I can't promise it yet. There are other projects that I need to work on besides exifr.

[deoxilix]

Hello. I don't even know that this format exists, let alone how it works. So unfortunately I don't plan on supporting it any time soon. But I'm open to PR and I'd be happy to provide guidance if you'd like to implement it. For now I'm only planning to implement PNG and WebP.

Hi @MikeKovarik,
by when can we expect WebP support?

Thanks.