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Ppmtoyuvsplit User Manual
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ppmtoyuvsplit
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Updated: 06 March 2003
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Table Of Contents
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NAME
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ppmtoyuvsplit - convert a PPM image to 3 subsampled raw YUV files
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SYNOPSIS
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\fBppmtoyuvsplit\fR
\fIbasename\fR
[\fIppmfile\fR]
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DESCRIPTION
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This program is part of Netpbm.
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\fBppmtoyuvsplit\fR reads a PPM image as input.  Produces 3 raw
files \fIbasename\fR.Y, \fIbasename\fR.U and \fIbasename.V\fR as
output.
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The output files are the subsampled raw YUV representation of the
input PPM image, as required by the Stanford MPEG codec.  The Y output
file contains a byte for each pixel in the image, with the rows going
from top to bottom and the columns within each row going left to
right.  The U and V output files are arranged similarly, except that
each byte represents a square of 4 pixels of the image.  The value is
the arithmetic mean of the value for each of those 4 pixels.  Hence, the
Y file is 4 times the size of the U file or V file.
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The YUV values are scaled according to CCIR.601, as assumed by
MPEG.
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SEE ALSO
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yuvsplittoppm,
ppmtoyuv,
ppmtoeyuv,
ppmtompeg,
ppm
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AUTHOR
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Copyright (C) 1993 by Andre Beck. (Andre_Beck@IRS.Inf.TU-Dresden.de)
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Based on ppmtoyuv.c
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Table Of Contents
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