JBIG2ENC(1)

📦
version 0.32 · 4 versions
, in ubuntu stonking

✨ NAME ✨

okay so bestie, welcome to jbig2enc — the encoder for JBIG2 💅 (yes it's in section 1 of the manual, iykyk). it takes your images and turns them into lil JBIG2 bitstreams and honestly? iconic behavior.

🌸 SYNOPSIS 🌸

jbig2 [options] <input filenames...>

like. you run jbig2, you throw some options at it, you hand it a pile of input filenames, and it does its thing. the way that this is literally the whole interface. 🫶

🎀 OPTIONS 🎀

the full menu, no skips, no cap, every single one of them:

  • -b <basename> — sets the output file root name, and this one only matters when you're doing symbol coding, so keep that in mind bestie 💖
  • -d, --duplicate-line-removal — uses TPGD in the generic region coder. bye bye duplicate lines ✨
  • -p, --pdf — produces PDF ready data. lowkey the reason half of y'all are even here fr fr 📄
  • -s, --symbol-mode — uses a text region instead of the generic coder. main character mode for text 🦋
  • -t <threshold> — sets the classification threshold for the symbol coder. default is 0.92 ⭐
  • -w <weight> — sets the classification weight for the symbol coder. default is 0.50 💜
  • -T <bw threshold> — sets the 1 bpp threshold. default is 200 🌸
  • -G, --global — uses the global BW threshold on 8 bpp images. heads up: the default is to use local (adaptive) thresholding, so this flips you to the other vibe entirely 👑
  • -r, --refine — uses refinement. ⚠️ it requires -s, and it's lossless, so don't be out here pairing it with anything else and then acting surprised 🙈
  • -O <outfile> — dumps the thresholded image as a PNG. lil preview moment, obsessed 🎀
  • -2 — upsamples 2x before thresholding 🌈
  • -4 — upsamples 4x before thresholding 🔥
  • -S — removes images from mixed input and saves them separately 🍓
  • -j, --jpeg-output — writes images from mixed input as JPEG 💅
  • -a, --auto-thresh — uses automatic thresholding in the symbol encoder ✨
  • -D, --dpi — forces dpi 📐
  • --no-hash — disables use of the hash function for automatic thresholding. literally just turns the hashing off, that's it 💀
  • -V, --version — version info ⭐
  • -v — be verbose. it says more stuff. slay 🗣️

and when -v does its little version thing, the info it's working with looks a whole lot like this:

leptonica-1.86.0

libgif 5.2.2 : libjpeg 8d (libjpeg-turbo 2.1.5) : libpng 1.6.58 :
libtiff 4.7.0 : zlib 1.3.1 : libwebp 1.5.0 : libopenjp2 2.5.4

look at all those libraries holding hands 🫶🧚

and that's the whole page bestie, no filler, no gatekeeping 💖 this was jbig2enc 0.32, dated June 2026, and it ate. periodt. 👑

📦 where this page comes from