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 path/to/image.png

• Print information for an image with [c]olorized output:

pngcheck -c path/to/image.png

• Print [v]erbose information for an image:

pngcheck -cvt path/to/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 path/to/image.png

• Search for PNGs within another file and e[x]tract them:

pngcheck -x path/to/image.png