pngcheck pngcheck is the official PNG tester and debugger.
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PNG tester PNG tester PNG debugger PNG checker pngcheck

pngcheck Description

pngcheck is the official PNG tester and debugger. pngcheck verifies the integrity of PNG, JNG and MNG files (by checking the internal 32-bit CRCs and decompressing the image data); pngcheck can optionally dump almost all of the chunk-level information in the image in human-readable form.For example, it can be used to print the basic statistics about an image (dimensions, bit depth, etc.); to list the color and transparency info in its palette (assuming it has one); or to extract the embedded text annotations.All PNG and JNG chunks are supported, plus almost all MNG chunks (everything but PAST, MAGN, DISC, DROP, DBYK, ORDR, and pHYg). This is a command-line program with batch capabilities (e.g., "pngcheck *.png").What's New in This Release:· This version adds an option to colorize the output (using ANSI colors), enhances the verbose output for interlaced images, and fixes three bugs that showed up in the most recent release of the brokensuite test images.

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