Image and Video Processing Libraries in Ptolemy II by ... - CiteSeerX

P2
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10 10
15
5 0 0 5 0 0 10 10 10 0
5 0 0 5 0 0 0 10 0 0
5 0 0 5 0 0 0 10 0 0
5 0 0 5 0 0 0 10 0 0
5 5 5 5 0 0 0 10 0 0
5 0 0 5 0 0 0 10 0 0
5 0 0 5 0 0 0 10 0 0
5 0 0 5 0 0 0 10 0 0
5 0 0 5 0 0 0 10 0 0
5 0 0 5 0 0 10 10 10 0
Figure 3.3: A sample PGM file. The P2 specifies that it is a PGM ASCII file.
To specify the file with RAW data, the magic number would be P5. Characters
following a pound sign are ignored. The width of the image is then specified
with ASCII characters as a decimal number. This is followed by a whitespace.
Then the height is specified with ASCII characters as a decimal number. This
is followed by another whitespace. Then the maximum gray value is specified,
again as a ASCII decimal. Then width times height gray values are specified
by ASCII decimals separated by whitespaces. No line should be longer then 70
characters.
P3
4 4
15
0 0 0 0 0 0 0 0 0 15 0 15
0 0 0 0 15 7 0 0 0 0 0 0
0 0 0 0 0 0 0 15 7 0 0 0
15 0 15 0 0 0 0 0 0 0 0 0
Figure 3.4: A sample PPM file. The P3 specifies that it is a PPM ASCII file.
To specify the file with RAW data, the magic number would be P6. Character
following a pound sign are ignored. The width and height of the image are
specified like a PGM file, however the value following these integers is the maximum
color value. The three values for each pixel represent red, green, and blue
respectively.
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