Software: Apache/2.2.3 (CentOS). PHP/5.1.6 uname -a: Linux mx-ll-110-164-51-230.static.3bb.co.th 2.6.18-194.el5PAE #1 SMP Fri Apr 2 15:37:44 uid=48(apache) gid=48(apache) groups=48(apache) Safe-mode: OFF (not secure) /usr/share/doc/netpbm-10.35.58/userguide/ drwxr-xr-x |
Viewing file: pbmreduce.html (2.29 KB) -rw-r--r-- Select action/file-type: (+) | (+) | (+) | Code (+) | Session (+) | (+) | SDB (+) | (+) | (+) | (+) | (+) | (+) | pbmreduceUpdated: 02 August 1989Table Of Contents NAMEpbmreduce - read a PBM image and reduce it N timesSYNOPSISpbmreduce [-floyd|-fs|-threshold] [-value val] N [pbmfile]You can abbreviate any option to its shortest unique prefix. DESCRIPTIONThis program is part of Netpbm. pbmreduce reads a PBM image as input and reduces it by a factor of N, producing a PBM image as output. pbmreduce duplicates a lot of the functionality of pamditherbw; you could do something like pamscale | pamditherbw, but pbmreduce is a lot faster. You can use pbmreduce to "re-halftone" an image. Let's say you have a scanner that only produces black&white, not grayscale, and it does a terrible job of halftoning (most b&w scanners fit this description). One way to fix the halftoning is to scan at the highest possible resolution, say 300 dpi, and then reduce by a factor of three or so using pbmreduce. You can even correct the brightness of an image, by using the -value option. OPTIONSBy default, pbmreduce does the halftoning after the reduction via boustrophedonic Floyd-Steinberg error diffusion; however, you can use the -threshold option to specify simple thresholding. This gives better results when reducing line drawings. The -value option alters the thresholding value for all quantizations. It should be a real number between 0 and 1. Above 0.5 means darker images; below 0.5 means lighter. SEE ALSOpamenlarge, pamscale, pamditherbw, pbmAUTHORCopyright (C) 1988 by Jef Poskanzer.Table Of Contents |
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