ppmtoyuvsplit

   Updated: 06 March 2003
   Table Of Contents

NAME

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

SYNOPSIS

   ppmtoyuvsplit basename [ppmfile]

DESCRIPTION

   This program is part of Netpbm.

   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, ppmtoyuv, ppmtoeyuv, ppmtompeg, ppm

AUTHOR

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

   Based on ppmtoyuv.c
     _________________________________________________________________



Table Of Contents

     * NAME
     * SYNOPSIS
     * DESCRIPTION
     * SEE ALSO
     * AUTHOR

UNIX/Linux commands referenced on this page:

1. convert
2. raw
3. basename
4. as
5. file
6. size
7. yuvsplittoppm
8. ppmtoyuv
9. ppmtoeyuv
10. ppmtompeg