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Shell Programming and Scripting
Reading Input from File and Duplicates Output
Post 86860 by noelcantona on Tuesday 18th of October 2005 04:59:28 AM
10-18-2005
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LEARN ABOUT DEBIAN
ppmntsc
PPMNTSC(1) General Commands Manual PPMNTSC(1) NAME
ppmntsc - make a portable pixmap look like taken from an American TV SYNOPSIS
ppmntsc [ --pal ] [ --legalonly ] [ --illegalonly ] [ --correctedonly ] [ --verbose ] [ --debug ] [ infile ] Minimum unique abbreviations of options are acceptable. DESCRIPTION
This program makes colors legal in the NTSC (or PAL) color systems. Often, images generated on the computer are made for use in movies which ultimately end up on video tape. However, the range of colors (as specified by their RGB values) on a computer does not match the range of colors that can be represented using the NTSC (or PAL) systems. If an image with "illegal" colors is sent directly to an NTSC (or PAL) video system for recording, the "illegal" colors will be clipped. This may result in an undesirable looking picture. This utility tests each pixel in an image to see if it falls within the legal NTSC (or PAL) range. If not, it raises or lowers the pixel's saturation in the output so that it does fall within legal limits. Pixels that are already OK just go unmodified into the output. Input is from the file named input. If input is -, input is from Standard Input. If you don't specify input, input is from Standard Input. Output is always to Standard Output. This program handles multi-image PPM input, producing multi-image PPM output. OPTIONS
--pal Use the PAL transform instead of the default NTSC. --verbose Print a grand total of the number of illegal pixels. --debug Produce a humongous listing of illegal colors and their legal counterparts. NOTE: This option may produce a great deal of output. --legalonly Output only pixels that are already legal. Output black in place of pixels that are not. --illegalonly Output only pixels that are illegal (and output them uncorrected). Output black in place of pixels that are already legal. --correctedonly Output only pixels that are corrected versions of illegal pixels. Output black in place of pixels that are already legal. SEE ALSO
ppm(5), ppmdepth(1), ppmdim(1), ppmbrighten(1) AUTHOR
Wes Barris, Minnesota Supercomputer Center, Inc., Bryan Henderson 4th Berkeley Distribution April 19, 2000 PPMNTSC(1)