NAME
ppm - portable pixmap file format

DESCRIPTION
The portable pixmap format is a lowest common denominator color image
file format. The definition is as follows:

- A "magic number" for identifying the file type. A ppm file's magic
number is the two characters "P3".

- Whitespace (blanks, TABs, CRs, LFs).

- A width, formatted as ASCII characters in decimal.

- Whitespace.

- A height, again in ASCII decimal.

- Whitespace.

- The maximum color-component value, again in ASCII decimal.
(Typically 255)

- Whitespace.

- Width * height pixels, each three ASCII decimal values between 0 and
the specified maximum value, starting at the top-left corner of the
pixmap, proceeding in normal English reading order. The three values
for each pixel represent red, green, and blue, respectively; a value of
0 means that color is off, and the maximum value means that color is
maxxed out.

- Characters from a "#" to the next end-of-line are ignored (comments).

- No line should be longer than 70 characters.

Here is an example of a small pixmap in this format:
P3
# feep.ppm
4 4
255
0 0 0 0 0 0 0 0 0 15 0 15
0 0 0 0 150 0 0 0 0 0 0 0
0 0 0 0 0 0 0 255 9 0 0 0
255 0 255 0 0 0 0 0 0 0 0 0

Programs that read this format should be as lenient as possible,
accepting anything that looks remotely like a pixmap.