ppmntsc
make a portable pixmap look like taken from an American TV
see also :
ppmdim - ppmbrighten
Synopsis
ppmntsc
[ --pal ] [
--legalonly ] [
--illegalonly ] [
--correctedonly ] [
--verbose ] [ --debug
] [ infile ]
Minimum unique
abbreviations of options are acceptable.
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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.
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,
ppmdepth, ppmdim ,
ppmbrighten
author
Wes Barris,
Minnesota Supercomputer Center, Inc., Bryan Henderson