PNGcheck Test PNG, JNG or MNG image files for corruption, and print size/type info
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check test png test png png checker check image

PNGcheck Description

Test PNG, JNG or MNG image files for corruption, and print size/type info PNGcheck is an open source command line based tool that helps you check the PNG signature bytes (with tests for various forms of text-mode corruption), chunks (CRCs, dependencies, out-of-range values), and compressed image data (IDAT zlib stream). In addition, PNGcheck will optionally dump the contents of PNG, JNG and MNG image streams in more-or-less human- readable form.Note: MNG support is more informational than conformance-oriented.Installation and usage: Unarchive, open a Terminal window, go to PNGcheck's folder and run the following commands from the command line:gcc pngcheck.c -o pngcheck./pngcheck Requirements: · Apple Xcode What's New in This Release: · zlib support (to test the compressed stream and, optionally, to print out the image's row filters) · support for all remaining known PNG chunks (conformance) · complete support for all known MNG and JNG chunks (informational) · extended support for printing palettes (includes transparency info and histograms) · color support · improved error-checking · info on the compression factor of the image (expressed as a percentage, where 0% is no compression and 100% would be total compression; note that this can be negative since it counts PNG's chunk overhead against the compression factor) · png-fix-IDAT-windowsize utility · pngsplit utility · compilation support for Win32 (using MSVC), RISC OS, and Amiga

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