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pngtopnm.man
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pngtopnm(1) AMIGA (06 June 1995) pngtopnm(1)
NAME
pngtopnm - convert a Portable Network Graphics file into a
portable anymap
SYNOPSIS
pngtopnm [-verbose] [-text] [-alpha|-mix] [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.
-alpha
Output the alpha channel or transparency mask of the
image. The result is either a pbm file or pgm file,
depeding on whether different levels of transparency
appear.
-mix Compose the image with the transparency or alpha mask
against a black background.
-text
Print tEXt, zTXt and tIME chunks to stderr.
All flags can be abbreviated to their shortest unique
prefix.
SEE ALSO
pnmtopng(1), ptot(1), pnm(5)
BUGS
Due the fact that PNM files only include image data, it is
not possible to preserve extra data (e.g. comments) stored
with an image file. Instead of pngtopnm|pnmtoxxx, a specific
converter should be used, if available. E.g. ptot (PNG to
TIFF conversion), etc. (This is not really a bug in
pngtopnm, more a general problem with intermediate formats.)
Information about scaling is not used. sBIT chunks are
ignored.
-mix should use the background color, if specified, instead
of black.
AUTHOR
Page 1 (printed 7/15/95)
pngtopnm(1) AMIGA (06 June 1995) pngtopnm(1)
Copyright (C) 1995 by Alexander Lehmann.
Page 2 (printed 7/15/95)