Ppmtoyuvsplit User Manual(1)General Commands ManuaPpmtoyuvsplit User Manual(1)
NAME
ppmtoyuvsplit - convert a PPM image to 3 subsampled raw YUV files
SYNOPSIS
ppmtoyuvsplit basename [ppmfile]
DESCRIPTION
This program is part of Netpbm(1).
ppmtoyuvsplit reads a PPM image as input. Produces 3 raw files base-
name.Y, basename.U and basename.V as output.
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 rep-
resents 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.
The YUV values are scaled according to CCIR.601, as assumed by MPEG.
OPTIONS
There are no command line options defined specifically for ppmtoyuvs-
plit, but it recognizes the options common to all programs based on
libnetpbm (See
Common Options ⟨index.html#commonoptions⟩ .)
SEE ALSO
yuvsplittoppm(1), ppmtoyuv(1), ppmtoeyuv(1), ppmtompeg(1), ppm(1)
AUTHOR
Copyright (C) 1993 by Andre Beck. (Andre_Beck@IRS.Inf.TU-Dresden.de)
Based on ppmtoyuv.c
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/ppmtoyuvsplit.html
netpbm documentation 06 March 2003 Ppmtoyuvsplit User Manual(1)
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