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PNGer: A low-level PNG image file manipulation utility Version 0.1 - 04 April 2008 Copyright (c) 2008 Peter Gordon <pete()petergordon.org.uk> PNGer contains portions of code from TweakPNG 1.2.1 Copyright (c) 1999-2004 Jason Summers <jason1()pobox.com> <http://entropymine.com/jason/tweakpng/> ==================== License ==================== This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, 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 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA A copy of the GNU General Public License is included in the file COPYING.txt. ======================================================== To get the latest version of PNGer, visit the PNGer home page at http://www.petergordon.org.uk/pnger/ ================== Requirements ======================== - A computer running AmigaOS4 - A mouse or equivalent input device for the palette editor. - Some knowledge of the PNG file format. To install: Create an empty directory and unarchive the contents of pnger.lha into it. To run: Double click the "pnger" icon, or run pnger from the CLI. To uninstall: Delete the directory you created and its contents. ==================== Introduction ==================== PNGer is an interactive PNG file editor utility that allows you to view and modify some of the meta-information stored in PNG image files. It is not a real image editor or viewer (although it has an option to view the current state of the loaded PNG file in multiview). The rest of this document will be difficult to understand if you are not familiar with the details of the PNG file format. To learn about it, look for the specification at the PNG home page, <http://www.libpng.org/pub/png/>. Viewing files in PNGer may, however, make it easier to become familiar with the PNG format. Here are a few of the possible uses of PNGer: - To remove unneeded or unwanted chunks, usually to reduce file size. - To annotate an image file by adding or modifying text chunks. - To change background colors and transparency settings. - To help make test images for testing applications that read PNG files.
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