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Ppmntsc User Manual(0)                                  Ppmntsc User Manual(0)



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 is part of Netpbm(1).

       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 a television screen.  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 pro-
              duce 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
       pamdepth(1), ppmdim(1), ppmbrighten(1), ppm(1)


AUTHOR
       Wes Barris, Minnesota Supercomputer Center, Inc., Bryan Henderson



netpbm documentation            April 19, 2000          Ppmntsc User Manual(0)