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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)
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Nearby terms:
Portable Forth Environment « Portable Network Graphics « Portable Operating System Interface « Portable Pixmap » Portable Scheme Debugger » Portable Scheme Interpreter » Portable Standard Lisp
This article was derived from the Free Online Dictionary of Computers and is available under ther terms of the GNU Free Documentation License.
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