1Ppmtoyuvsplit User Manual(0)                      Ppmtoyuvsplit User Manual(0)
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NAME

6       ppmtoyuvsplit - convert a PPM image to 3 subsampled raw YUV files
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SYNOPSIS

10       ppmtoyuvsplit basename [ppmfile]
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DESCRIPTION

14       This program is part of Netpbm(1).
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16       ppmtoyuvsplit  reads  a PPM image as input.  Produces 3 raw files base‐
17       name.Y, basename.U and basename.V as output.
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19       The output files are the subsampled raw YUV representation of the input
20       PPM  image,  as required by the Stanford MPEG codec.  The Y output file
21       contains a byte for each pixel in the image, with the rows  going  from
22       top to bottom and the columns within each row going left to right.  The
23       U and V output files are arranged similarly, except that each byte rep‐
24       resents a square of 4 pixels of the image.  The value is the arithmetic
25       mean of the value for each of those 4 pixels.  Hence, the Y file  is  4
26       times the size of the U file or V file.
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28       The YUV values are scaled according to CCIR.601, as assumed by MPEG.
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SEE ALSO

32       yuvsplittoppm(1), ppmtoyuv(1), ppmtoeyuv(1), ppmtompeg(1), ppm(1)
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AUTHOR

37       Copyright (C) 1993 by Andre Beck. (Andre_Beck@IRS.Inf.TU-Dresden.de)
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39       Based on ppmtoyuv.c
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43netpbm documentation             06 March 2003    Ppmtoyuvsplit User Manual(0)