phpman > man > ppmntsc(1)

Che Dong

Make the RGB colors in a PPM image compatible with NTSC or PAL color systems.

Make the RGB colors in a PPM image compatible with NTSC color systems
ppmntsc {{path/to/input_file.ppm}} > {{path/to/output_file.ppm}}
Make the RGB colors in a PPM image compatible with PAL color systems
ppmntsc --pal {{path/to/input_file.ppm}} > {{path/to/output_file.ppm}}
Print the number of illegal pixels in the input image to `stderr`
ppmntsc {{--verb|--verbose}} {{path/to/input_file.ppm}} > {{path/to/output_file.ppm}}
Output only legal/illegal/corrected pixels, set other pixels to black
ppmntsc --{{legalonly|illegalonly|correctedonly}} {{path/to/input_file.ppm}} > {{path/to/output_file.ppm}}

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 ] [ --de‐‐
       bug ] [ 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 "ille‐
       gal" 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)

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