pngtextadd adds text comments to a
PNG image file using
libpng. It's pretty
minimal, but it's surprising how many image manipulation programs lack support
for setting text parts of PNG so with pngtextadd you can at least
ensure a description or author's name.
Read more in the
online man page.
pngtextadd is free software (free as in freedom), published under the terms of the GNU General Public License (v3 or up).
To build pngtextadd you'll need,
libpng
Download version 4 source here, or a Debian package here or from my repo.
pngtextadd-4.tar.gz(19k, and sig)
pngtextadd_4-0.1_i386.deb(8k, and sig)
The sig files are a Gnu PG ascii armoured signatures generated from my key.
The deb is built against
libpng16 which
includes "iTXt" international text. It should build against
libpng back to at least 1.2 if something else is desired.
Text parts of PNG can also be written with
Image::ExifTool
from Perl code. It can act on many file formats. Some setups are needed
to write non-standard PNG keywords.
Text parts can be displayed with
identify
from ImageMagick. It can act on
many image formats and also shows technical details about the image
content.
pnginfo from
pngtools
shows text parts and basic technical information.
pngmeta
shows text parts, in a couple of forms.
imagetext.el (mine) in
Emacs to display text with images.
This page Copyright 2009, 2010, 2011, 2013, 2014, 2015, 2016, 2017, 2018, 2019 Kevin Ryde,
except for the GPLv3 logo which is Copyright Free Software Foundation
and used here in
accordance with its terms.
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