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pngtopnm(1)							   pngtopnm(1)

NAME
       pngtopnm	 -  convert  a	Portable  Network  Graphics file into portable
       anymap

SYNOPSIS
       pngtopnm [-verbose] [-alpha | -mix] [-background color]
       [-gamma value] [-text file] [-time] [pngfile]

DESCRIPTION
       Reads a Portable Network Graphics as input.  Produces a portable anymap
       as  output.  The type of the output file depends on the input file - if
       it's black & white, a pbm file is written, else if it's grayscale a pgm
       file, else a ppm file.

OPTIONS
       -verbose
	      Display  the format of the input file and the type of the output
	      file. If the chunks are part of the png-file, the alpha,	trans‐
	      parency and gamma-values will be indicated.

       -alpha Output  the alpha channel or transparency mask of the image. The
	      result is either a pbm file or pgm file,	depending  on  whether
	      different levels of transparency appear.

       -mix   Compose  the image with the transparency or alpha mask against a
	      the background. When a background chunk is available that	 color
	      is taken, else black will do.

       -background color
	      If  no  background  color	 chunck is present in the png-file, or
	      when another color is required this parameter can be used to set
	      the  background  color  of images. This is especially useful for
	      alpha-channel images or those with transparency chunks. The for‐
	      mat,  to specify the color in, is either (in the case of orange)
	      "1.0,0.5,0.0", where the values are floats between zero and one,
	      or with the syntax "#RGB", "#RRGGBB" or "#RRRRGGGGBBBB" where R,
	      G and B are hexa-decimal numbers.

       -gamma value
	      Converts the image to a new display-gamma	 value.	 When  a  gAMA
	      chunk  is present in the png-file, the image-gamma value will be
	      used. When not, the image-gamma is considered to be  1.0.	 Based
	      on  the image-gamma and the display-gamma given with this option
	      the colors written to the pnm-file will be adjusted.
	      Because the gamma's of uncompensated monitors  are  around  2.6,
	      which results in an image-gamma of 0.45, some typical situations
	      are: when the image-gamma is 0.45 (use -verbose  to  check)  and
	      the  picture  is	too  light, your system is gamma-corrected, so
	      convert with "-gamma 1.0".  When no gAMA chunk is present or the
	      image-gamma is 1.0, use 2.2 to make the picture lighter and 0.45
	      to make the picture darker.

       -text file
	      Writes the tEXt and zTXt chunks  to  a  file,  in	 a  format  as
	      described	 in  the pnmtopng man-page.  These chunks contain text
	      comments or annotations.

       -time  Prints the tIME chunk to stderr.

       All flags can be abbreviated to their shortest unique prefix.

SEE ALSO
       pnmtopng(1), ptot(1), pnmgamma(1), pnm(5)

NOTE
       Instead of pngtopnm|pnmtoxxx, a specific converter should be  used,  if
       available. E.g.	ptot (PNG to TIFF conversion), etc.

BUGS
       There  could  be	 an  option to read the comment text from pnm comments
       instead of a separate file.

       The program could be much faster, with a bit of code optimizing.

AUTHORS
       Copyright (C) 1995-1997 by Alexander Lehmann
			       and Willem van Schaik.

				6 January 1997			   pngtopnm(1)
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