g4tweak - Handle G4-compressed black-and-white scans.
Holger Blasum 2006-07-01 
License GPL v. 2 or any higher version (at your choice) for any program file in C 
or python, GPL v. 2 or any higher version or LGPL or any higher version (at 
your choice) for tiff.c (de facto a mini-library), GLP v. 2 or any higher version or 
BSD (at your choice) for any shell script.

Stuff for handling G4 compressed scans. Experimental, may require 
tweaking. (Feedback and questions see email at http://www.blasum.net/holger/)
Some of it uses Sam Leffler's libtiff.

pdf2c4: Inverse functionality of c42pdf (see below): get TIFF data out of PDFs. 
The binaries are compiled on gnu/linux (gcc4), but the stuff should be 
somewhat portable (complain if not). g4rotate and g4split run on any
g4-compressed TIFF. pdf2c4 does not even uncompress the data, g4rotate
and g4split keep the 8-pixel-per-bit representation.
The main purpose the author uses the pdf2c4 programs for is to quickly 
manipulate scanned g4-compressed PDFs he has on file, eg to split a 
page into two which comes helpful if one has a pile of 2-on-1 page 
copies of eg journal articles. (eg run script/srupisright on the 1 page
rotated pdf2c4/sample-big.pdf gives the usable 2-page
pdf2c4/sample-big-transformed.pdf - of course this also works on 
multipage documents)

raw2pdf: python scripts to dump raw g4-compressed raw format scans into 
PDF (only some scanners, eg Fujitsu M3093, support g4-compressed "raw" format).

script: bash shell scripts that use the programs. Use at your own risk, read 
before using (they do contain rm statements), maybe helpful for inspiration.

For conversion of TIFF to PDF see http://c42pdf.ffii.org/

Related: http://g4tool.sourceforge.net/ , 
http://sourceforge.net/users/eichholz/ , 
http://www.vips.ecs.soton.ac.uk/ .