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pngstrip(1)                                                        pngstrip(1)




NAME

       pngstrip - rewrite a PNG file with all extraneous information removed


SYNOPSIS

       pngstrip       [-h(elp)]       [-8(bit_strip_to)]      [-a(lpha_strip)]
       [-e(xpand_to_rgb)] [-g(rayscale_convert)] [-r(es) DPM] infile outfile


DESCRIPTION

       pngstrip reads in a PNG image and writes it out again with all extrane-
       ous  information  removed, leaving only the bKGD, gAMA, pHYs, sRGB, and
       tRNS chunks.  It is called as part of the opt-png script.


OPTIONS

       -h     Print help and quit.

       -8     Strip 16-bit channel data down to 8-bit channel data.

       -a     Strip out any alpha channel data.  This option will  also  strip
              out the transparency (tRNS) chunk if it is present.

       -e     Expand a palette-based image to an RGB channel-based image.

       -g     Convert  an  RGB  channel-based  or  palette-based  image  to  a
              grayscale image.

       -r DPM Force the written PNG file to assume the specified resolution in
              the  pHYs  chunk.   Units are pixels-per-meter.  To convert from
              DPI to pixels, divide by 0.0254 (or multiply  by  39.37).   Note
              that this does not change the number of pixels in the image.  It
              only changes the assumed size of the pixels.


COPYRIGHT

       Copyright (C) 2004-2020 by Brian Lindholm.  This program is free  soft-
       ware; you can use it, redistribute it, and/or modify it under the terms
       of the GNU General Public License as published  by  the  Free  Software
       Foundation; either version 3, or (at your option) any later version.

       This  program  is  distributed  in the hope that it will be useful, but
       WITHOUT ANY  WARRANTY;  without  even  the  implied  warranty  of  MER-
       CHANTABILITY  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
       Public License for more details.



littleutils                       2020 Oct 16                      pngstrip(1)

littleutils 1.2.3 - Generated Tue Dec 1 16:40:22 CST 2020
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