pngcheck

Forensics tool for validating the integrity of PNG based (.png, .jng, .mng) image files. Can also extract embedded images and text from a file. More information: http://www.libpng.org/pub/png/apps/pngcheck.html.

• Verify the integrity of an image file:
  pngcheck {{path/to/file.png}}
• Check the file with [v]erbose and [c]olorized output:
  pngcheck -vc {{path/to/file.png}}
• Display contents of [t]ext chunks and [s]earch for PNGs within a specific file:
  pngcheck -ts {{path/to/file.png}}
• Search for, and e[x]tract embedded PNGs within a specific file:
  pngcheck -x {{path/to/file.png}}