imgtoppm(1) [php man page]

imgtoppm(1)						      General Commands Manual						       imgtoppm(1)

NAME

       imgtoppm - convert an Img-whatnot file into a portable pixmap

SYNOPSIS

       imgtoppm [imgfile]

DESCRIPTION

       Reads an Img-whatnot file as input.  Produces a portable pixmap as output.  The Img-whatnot toolkit is available for FTP on venera.isi.edu,
       along with numerous images in this format.

SEE ALSO

       ppm(5)

AUTHOR

       Based on a simple conversion program posted to comp.graphics by Ed Falk.

       Copyright (C) 1989 by Jef Poskanzer.

								 05 September 1989						       imgtoppm(1)

ppmtopgm(1)						      General Commands Manual						       ppmtopgm(1)

NAME

       ppmtopgm - convert a portable pixmap into a portable graymap

SYNOPSIS

       ppmtopgm [ppmfile]

DESCRIPTION

       Reads  a  portable  pixmap  as  input.  Produces a portable graymap as output.  The output is a "black and white" rendering of the original
       image, as in a black and white photograph.  The quantization formula used is .299 r + .587 g + .114 b.

       Note that although there is a pgmtoppm program, it is not necessary for simple conversions from pgm to ppm , because any  ppm  program  can
       read  pgm  (and	pbm  ) files automatically.  pgmtoppm is for colorizing a pgm file.  Also, see ppmtorgb3 for a different way of converting
       color to gray.  And ppmdist generates a grayscale image from a color image, but in a way that makes it easy to differentiate  the  original
       colors, not necessarily a way that looks like a black and white photograph.

QUOTE

       Cold-hearted orb that rules the night
       Removes the colors from our sight
       Red is gray, and yellow white
       But we decide which is right
       And which is a quantization error.

SEE ALSO

       pgmtoppm(1),ppmtorgb3(1),rgb3toppm(1),ppmdist(1),ppm(5),pgm(5)

AUTHOR

       Copyright (C) 1989 by Jef Poskanzer.

								   10 April 2000						       ppmtopgm(1)