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JB2E is a file format for 1-bit (bi-level) images compressed in the JBIG2 compression standard.

Unfortunately, it seems to have extremely poor support, even though it's been an ISO standard for nearly 20 years, and is occasionally/often used within PDFs.

When in a PDF, most or all readers (on my Linux distribution) support it, but take a very long time decompressing it - perhaps 5 seconds per page if not more on a relatively new 4-core PC with plenty of RAM.

Outside of a PDF, things get worse:

  • Many image viewers won't open a .jb2e file
  • Imagemagick won't convert a .jb2e file, saying:
    convert-im6.q16: no decode delegate for this image format `JB2E' @ error/constitute.c/ReadImage/504.
    
  • gimp 2.8 won't open .jb2e files

How should I handle such files, then? Is it because I don't have latest-and-greatest versions of everything (I use Devuan ASCII ~= Debian Stretch)? What utilities and apps can I use which do support .jb2e files?

Required features:

  • Gratis
  • Runs on Linux

Desired features:

  • Libre
  • Fast
  • Available in Debian Stretch
  • jbig2dec should provide decoding support, and I was able to convert JBIG2 elements of a PDF document to PNG images using xpdf. – maxime.bochon Jul 17 at 8:41

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