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1995-07-15
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pnmtopng(1) AMIGA (27 May 1995) pnmtopng(1)
NAME
pnmtopng - convert a portable anymap into a Portable Network
Graphics file
SYNOPSIS
pnmtopng [-verbose] [-interlace] [-downscale] [pnmfile]
DESCRIPTION
Reads a portable pixmap as input. Produces a Portable
Network Graphics file as output.
Color values in PNG files are either eight or sixteen bits
wide, so pnmtopng will automatically scale colors to have a
maxval of 255 or 65535. Grayscale files will be produced
with bit depths 1, 2, 4, 8 or 16. An extra pnmdepth step is
not necessary.
OPTIONS
-verbose
Display the format of the output file.
-interlace
Creates an interlaced PNG file (Adam7).
-downscale
Enables scaling of maxvalues of more then 65535 to 16
bit. Since this means loss of image data, the step is
not performed by default.
All flags can be abbreviated to their shortest unique
prefix.
SEE ALSO
pngtopnm(1), gif2png(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 xxxtopnm|pnmtopng, a specific
converter should be used, if available. E.g. gif2png (GIF
conversion), etc. (This is not really a bug in pnmtopng,
more a general problem with intermediate formats.)
Information about scaling is not preserved. No sBIT chunks
are created.
AUTHOR
Copyright (C) 1995 by Alexander Lehmann, based on pnmtorast,
(C) 1989,1990 by Jef Poskanzer.
Page 1 (printed 7/15/95)