pngtopnm

Section: User Commands (1)
Updated: 06 June 1995
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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

Copyright (C) 1995 by Alexander Lehmann.


 

Index

NAME
SYNOPSIS
DESCRIPTION
OPTIONS
SEE ALSO
BUGS
AUTHOR

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