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| gfx/pbm/ptrans-mos.lha | | | No screenshot available |
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PTrans scales and dithers an image while holding only 2 scanlines in memory at a
time.
This allows extremely large images to be processed using very little RAM.
PTRANS Copyright (C) 2008 Paul Sheer All rights reserved.
- www.protonet.co.za -
usage: ptrans [-multiply W,H] [-scale W,H] [-input FILENAME] [-gamma F] [-s F]
[-threshold N] [-grayscale] [-float] [-output FILENAME]
Produces PBM (i.e. P4) dithered output, or PGM (i.e. P5) gray-level output
from PPM or PGM (P5 or P6) input.
Reads/writes from/to stdin/out if -input/-output not specified
-multiply makes bigger dots (try -multiply 3,3),
-scale sets output width and height in pixels using linear
interpolation.
-gamma adjusts brightness F range 0.2 to 5.0
-s use S curve color adjustment F is gamma value of 0.2 to 5.0.
Good for contrast adjustment. -s 1000.0 is equivalent to
-threshold 32768
-threshold clips N range 0-65535
-float floating point interpolation
-grayscale output P5 gray-level file, 1 byte per pixel
Example: some HP printers can be used as an A4 photostat machine
in combination with a scanner:
scanimage -x 210 -y 297 --resolution 300 | \
ptrans -scale 3307,7014 -multiply 3,1 -s 1.2 | \
foo2xqx -g 9921x7014 -u 50x0 -r1200x600 -p9 -m1 -n1 -d1 -s7 -J -U -D0 \
> /dev/usblp0 |
Contents of gfx/pbm/ptrans-mos.lhaPERMISSION UID GID PACKED SIZE RATIO METHOD CRC STAMP NAME
---------- ----------- ------- ------- ------ ---------- ------------ ----------
[generic] 12330 39460 31.2% -lh5- c155 May 31 1980 ptrans
[generic] 873 1597 54.7% -lh5- 6f6c May 31 1980 ptrans-mos.readme
[generic] 5018 23565 21.3% -lh5- 4ebe Aug 3 1980 ptrans.c
---------- ----------- ------- ------- ------ ---------- ------------ ----------
Total 3 files 18221 64622 28.2% May 31 21:10
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