pngcheck(1)							    2012-03-09							       pngcheck(1)

NAME

       pngcheck - Test PNG image files for corruption, display size, type, compression info

SYNOPSIS

	 pngcheck [-vqt7f] file.png [file.png [...]]
	 pngcheck [-vqt7f] file.mng [file.mng [...]]
	 pngcheck -{sx}[vqt7f] file-containing-PNGs...

	 ... | pngcheck [-sx][vqt7f]

OPTIONS

       -v  test verbosely (print most chunk data).

       -q  test quietly (only output errors).

       -t  print contents of tEXt chunks (can be used with -q).

       -7  print contents of tEXt chunks, escape chars >=128 (for 7-bit terminals).

       -p  Print contents of PLTE, tRNS, hIST, sPLT and PPLT (can be used with -q).

       -f  Force continuation even after major errors.

       -s  Search for PNGs within another file.

       -x  Search for PNGs and extract them when found.

DESCRIPTION

       pngcheck is the official PNG tester and debugger. Originally designed simply to test the CRCs within a PNG image file (e.g., to check for
       ASCII rather than binary transfer), it has been extended to check and optionally print almost all the information about a PNG image and to
       verify that it conforms to the PNG specification. It also includes partial support for MNG animations.

       It can dump the chunk-level information in the image in human-readable form. For example, it can be used to print the basic stats about an
       image (dimen sions, bit depth, etc.); to list the color and transparency info in its palette; or to extract the embedded text annotations.
       All PNG and JNG chunks are supported, plus almost all MNG chunks (everything but PAST, DISC, tERm, DROP, DBYK, and ORDR). This is a
       command-line program with batch capabilities (e.g., pngcheck *.png).

ENVIRONMENT

       None.

FILES

       None.

SEE ALSO

       pngchunkdesc(1) pngchunks(1) pngcomp(1) pngcp(1) pngcrush(1) pnginfo(1) pngmeta(1) pngnq(1) pngquant(1)

AUTHORS

       Program was written by <foo@example.com>.

       This manual page was written by Kevin M. Rosenberg <kmr@debian.org> for the Debian GNU system (but may be used by others). Updated by Jari
       Aalto <jari.aalto@cante.net>. Released under license GNU GPL v2 or (at your option) any later version. For more information about license,
       visit <http://www.gnu.org/copyleft/gpl.html>.

pngcheck							    2012-02-14							       pngcheck(1)