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RedHat 9 (Linux i386) - man page for ppmntsc (redhat section 1)

PPMNTSC(1)			     General Commands Manual			       PPMNTSC(1)

NAME
       ppmntsc - Make RGB colors legal for NTSC or PAL color systems.

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  gener-
       ated  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  record-
       ing, the "illegal" colors will be clipped.  This may result in an undesirable looking pic-
       ture.

       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)


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