Ppmntsc User Manual(1) General Commands Manual Ppmntsc User Manual(1)
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 Stan-
dard 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
In addition to the options common to all programs based on libnetpbm
(most notably -quiet, see
Common Options ⟨index.html#commonoptions⟩ ), ppmntsc recognizes the
following command line 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 uncor-
rected). Output black in place of pixels that are already le-
gal.
--correctedonly
Output only pixels that are corrected versions of illegal pix-
els. Output black in place of pixels that are already legal.
SEE ALSO
pamdepth(1), ppmdim(1), pambrighten(1), ppm(1)
AUTHOR
Wes Barris, Minnesota Supercomputer Center, Inc., Bryan Henderson
DOCUMENT SOURCE
This manual page was generated by the Netpbm tool 'makeman' from HTML
source. The master documentation is at
http://netpbm.sourceforge.net/doc/ppmntsc.html
netpbm documentation 19 April 2000 Ppmntsc User Manual(1)
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