ppmntsc

 

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 PPMNTSC(1)                                             PPMNTSC(1)
 
 
 
NAME
        ppmntsc - Make RGB colors legal for NTSC or PAL color sys­
        tems.
 
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.
 
 
OPTIONS
        --pal  Use the PAL transform instead of the default  NTSC.
 
        --verbose
               Print  a  grand total of the number of illegal pix­
               els.
 
        --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
 
 
 
 1                         April 19, 2000               PPMNTSC(1)

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