ppmntsc - make a portable pixmap look like taken from an American TV


   ppmntsc [ --pal ] [ --legalonly ] [ --illegalonly ] [ --correctedonly ]
   [ --verbose ] [ --debug ] [ infile ]

   Minimum unique abbreviations of options are acceptable.


   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

   Output is always to Standard Output.

   This program handles multi-image PPM input, producing  multi-image  PPM


   --pal  Use the PAL transform instead of the default NTSC.

          Print a grand total of the number of illegal pixels.

          Produce  a  humongous  listing of illegal colors and their legal
          counterparts.  NOTE:  This option may produce a  great  deal  of

          Output  only  pixels  that  are  already legal.  Output black in
          place of pixels that are not.

          Output  only  pixels  that  are   illegal   (and   output   them
          uncorrected).   Output black in place of pixels that are already

          Output only  pixels  that  are  corrected  versions  of  illegal
          pixels.  Output black in place of pixels that are already legal.


   ppm(5), ppmdepth(1), ppmdim(1), ppmbrighten(1)


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


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