Is there a way to work with images in jpeg2000 format?
Thumbnails are not generated. I set up the mime type and extensions correctly.
In fact, I think the problem is actually with ImageMagick. It doesn’t work under Debian (Jessie) or Ubuntu (Artful) for my Omeka-s installations.
I think your suspicion is correct about ImageMagick. That’s the default that we use to create thumbnails. If possible, upgrading it might be the easiest step.
You’re right, jp2 conversion seems to work with the latest version of ImageMagick.
I compiled this version of ImageMagick because it is not available in debian packages.