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

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

       ppmtoyuvsplit basename [ppmfile]

       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 out-

       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.

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

       Copyright (C) 1993 by Andre Beck. (

       Based on ppmtoyuv.c

netpbm documentation             06 March 2003    Ppmtoyuvsplit User Manual(0)