Ppmtoyuvsplit User Manual(0)                      Ppmtoyuvsplit User Manual(0)



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
       basename.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
       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.

       The YUV values are scaled according to CCIR.601, as assumed by MPEG.


SEE ALSO
       yuvsplittoppm(1) , ppmtoyuv(1) , ppmtoeyuv(1) , ppmtompeg(1) , ppm(5)




AUTHOR
       Copyright (C) 1993 by Andre Beck. (Andre_Beck@IRS.Inf.TU-Dresden.de)

       Based on ppmtoyuv.c

netpbm documentation             06 March 2003    Ppmtoyuvsplit User Manual(0)