JPEG: Preserve metadata when writing CMYK

[caixiaoquan]

Hi Harald!
Please consider a enhancement of preserve metadata when writing CMYK.
https://stackoverflow.com/questions/77357401/why-metadata-is-ignored-when-write-a-cmyk-image?noredirect=1#comment136375922_77357401

[haraldk]

Good catch, thanks for reporting!

It's a bit harder than "usual" to write metadata for CMYK files, because the SDK JPEG writer plugin we delegate to is a bit picky (and has bugs). But I made some minor changes to the writeCMYK method to allow passing some selected metadata, ie. Exif, XMP, and other APPn segments (except ICC profile) + COM (JFIF comment) markers.

Need to clean up and perhaps make some more test cases, but I think it's doable. Will try to fix soon.

[haraldk]

Please try out the latest 3.11.0-SNAPSHOT version, and see if that works for you. 😀

[caixiaoquan]

Please try out the latest 3.11.0-SNAPSHOT version, and see if that works for you. 😀

OK，I will try later.Thanks!

[caixiaoquan]

Hi HaraldK! After upgrading to 3.11.0-SNAPSHOT, my difficulties were resolved. By the way, when is version 3.11.0 scheduled to be released?

[haraldk]

Thanks for testing and confirming the fix! 👍🏻

There's currently no fixed release schedule, but I hope to create a 3.10.1 release with this fix back-ported some time soon.