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 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.


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


Copyright (C) 1993 by Andre Beck. (

Based on ppmtoyuv.c

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