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ppm(5)							ppm(5)

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 deci-
	 mal.

       - 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
       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

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

       There  is  also a variant on the format, available by set-
       ting the RAWBITS option at compile time. This variant  is

			27 September 1991			1

ppm(5)							ppm(5)

       different in the following ways:

       - The "magic number" is "P6" instead of "P3".

       - The  pixel  values are stored as plain bytes, instead of
	 ASCII decimal.

       - Whitespace is not allowed in the pixels area, and only a
	 single character of whitespace (typically a newline) is
	 allowed after the maxval.

       - The files are smaller and many times faster to read  and
	 write.

       Note  that  this raw  format can only be used for maxvals
       less than or equal to 255.  If you use the ppm library and
       try to write a file with a larger maxval, it will automat-
       ically fall back on the slower but more general plain for-
       mat.

SEE ALSO
       giftoppm(1),   gouldtoppm(1),  ilbmtoppm(1),  imgtoppm(1),
       mtvtoppm(1), pcxtoppm(1), pgmtoppm(1), pi1toppm(1),  pict-
       toppm(1),     pjtoppm(1),     qrttoppm(1),    rawtoppm(1),
       rgb3toppm(1),   sldtoppm(1),   spctoppm(1),   sputoppm(1),
       tgatoppm(1),  ximtoppm(1),  xpmtoppm(1), yuvtoppm(1), ppm-
       toacad(1), ppmtogif(1),	ppmtoicr(1),  ppmtoilbm(1),  ppm-
       topcx(1),  ppmtopgm(1),	ppmtopi1(1),  ppmtopict(1),  ppm-
       topj(1), ppmtopuzz(1), ppmtorgb3(1),  ppmtosixel(1),  ppm-
       totga(1),     ppmtouil(1),    ppmtoxpm(1),    ppmtoyuv(1),
       ppmdither(1), ppmforge(1),  ppmhist(1),	ppmmake(1),  ppm-
       pat(1), ppmquant(1), ppmquantall(1), ppmrelief(1), pnm(5),
       pgm(5), pbm(5)

AUTHOR
       Copyright (C) 1989, 1991 by Jef Poskanzer.

			27 September 1991			2

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