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<HTML><HEAD><TITLE>Ppmntsc User Manual</TITLE></HEAD>
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<BODY>
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ppmntsc
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Updated: April 19, 2000
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Table Of Contents
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NAME
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ppmntsc - Make RGB colors legal for NTSC or PAL color systems.
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SYNOPSIS
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ppmntsc
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[--pal]
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[--legalonly]
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[--illegalonly]
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[--correctedonly]
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[--verbose]
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[--debug]
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[infile]
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Minimum unique abbreviations of options are acceptable.
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DESCRIPTION
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This program is part of Netpbm.
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This program makes colors legal in the NTSC (or PAL) color systems.
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Often, images generated on the computer are made for use in movies
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which ultimately end up on a television screen. However, the range of colors
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(as specified by their RGB values) on a computer does not match the
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range of colors that can be represented using the NTSC (or PAL)
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systems. If an image with "illegal" colors is sent directly
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to an NTSC (or PAL) video system for recording, the
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"illegal" colors will be clipped. This may result in an
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undesirable looking picture.
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This utility tests each pixel in an image to see if it falls
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within the legal NTSC (or PAL) range. If not, it raises or lowers the
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pixel's saturation in the output so that it does fall within legal
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limits. Pixels that are already OK just go unmodified into the
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output.
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Input is from the file named input. If input is
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-, input is from Standard Input. If you don't specify
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input, input is from Standard Input.
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Output is always to Standard Output.
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This program handles multi-image PPM input, producing multi-image
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PPM output.
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OPTIONS
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--pal
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Use the PAL transform instead of the default NTSC.
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--verbose
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Print a grand total of the number of illegal pixels.
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--debug
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Produce a humongous listing of illegal colors and their legal counterparts.
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NOTE: This option may produce a great deal of output.
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--legalonly
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Output only pixels that are already legal. Output black in place of pixels
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that are not.
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--illegalonly
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Output only pixels that are illegal (and output them uncorrected).
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Output black in place of pixels that are already legal.
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--correctedonly
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Output only pixels that are corrected versions of illegal pixels. Output
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black in place of pixels that are already legal.
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SEE ALSO
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pamdepth,
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ppmdim,
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ppmbrighten,
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ppm
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AUTHOR
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Wes Barris, Minnesota Supercomputer Center, Inc., Bryan Henderson
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Table Of Contents
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SYNOPSIS
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DESCRIPTION
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OPTIONS
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SEE ALSO
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AUTHOR
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</BODY>
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</HTML>
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