Portable Pixmap

file format (PPM) A colour image file format.

A PPM file contains the following:

a two character "magic number" - "P3",

the width in pixels,

the height in pixels,

the maximum colour component value,

HEIGHT rows of WIDTH pixels.

The rows are ordered from top to bottom with the pixels in

each row ordered from left to right. Each pixel is

represented as three values for red, green, and blue.

All parts are separated by whitespace and numbers are in

decimal ASCIII representation. A zero pixel component means

that colour is absent. Characters from a "#" to the next

end-of-line are ignored and no line should be longer than 70

characters.

Here is an example of a small pixmap in this format:

P3

# feep.ppm

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

A "RAWBITS" variant has magic number "P6", pixel values are

stored as plain binary bytes, instead of ASCII decimal and no

whitespace is allowed after a single whitespace character

after the maximum colour component value which must be less

than or equal to 255.

(1998-02-06)