pngcheck

Print detailed information about and verify PNG, JNG, and MNG files. More information: http://www.libpng.org/pub/png/apps/pngcheck.html.

• Print a summary for an image (width, height, and color depth):
  pngcheck {{image.png}}
• Print information for an image with [c]olorized output:
  pngcheck -c {{image.png}}
• Print [v]erbose information for an image:
  pngcheck -cvt {{image.png}}
• Receive an image from stdin and display detailed information:
  cat {{path/to/image.png}} | pngcheck -cvt
• [s]earch for PNGs within a specific file and display information about them:
  pngcheck -s {{image.png}}
• Search for PNGs within another file and e[x]tract them:
  pngcheck -x {{image.png}}