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ppm(5)									ppm(5)

       ppm - portable pixmap file format

       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.

       - 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:
       # feep.ppm
       4 4
	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 setting the RAWBITS
       option at compile time.	This variant is	 different  in	the  following

       - 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 char‐
	 acter of whitespace (typically a newline) is allowed after  the  max‐

       - 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 automatically fall back on the slower but more
       general plain format.

       giftoppm(1),  gouldtoppm(1),  ilbmtoppm(1),  imgtoppm(1),  mtvtoppm(1),
       pcxtoppm(1),  pgmtoppm(1),  pi1toppm(1), picttoppm(1), pjtoppm(1), qrt‐
       toppm(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),  ppmtopcx(1),  ppm‐
       topgm(1),  ppmtopi1(1),	ppmtopict(1),  ppmtopj(1),  ppmtopuzz(1), ppm‐
       torgb3(1), ppmtosixel(1), ppmtotga(1), ppmtouil(1),  ppmtoxpm(1),  ppm‐
       toyuv(1), ppmdither(1), ppmforge(1), ppmhist(1), ppmmake(1), ppmpat(1),
       ppmquant(1), ppmquantall(1), ppmrelief(1), pnm(5), pgm(5), pbm(5)

       Copyright (C) 1989, 1991 by Jef Poskanzer.

			       27 September 1991			ppm(5)

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