The lossless data compression fairies are having fun with me today...
- Scan 8.5" x 11" document at 1200dpi @ greyscale
- -> 60 MiB PNG, thank you
- Open PNG in GIMP, select a good threshold point, convert to 1bpp
- -> 514 KiB PNG
- Wait... 116:1 compression from 8-bit PNG to 1-bit PNG? HOW??
- convert to pdf
- "Warning, this file is really huge and may actually be a decompression bomb" lol, ok.
- -> 515 KiB PDF, nice
ocrmypdf foo.pdf document.pdf- -> 194 KiB PDF
- WHAT? HOW?!?
pdfimages -png document.pdf foo- -> 514 KiB PNG
- WHAT IS HAPPENING?!?