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...

         Can be used in pipe:

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

OPTIONS

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

       -f  Force continuation even after major errors.

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

       -q  Test quietly (only output errors).

       -s  Search for PNGs within another file.

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

       -v  test verbosely (print most chunk data).

       -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 (dimensions, 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)
       pngsplit(1)

AUTHORS

       Program was written by Greg Roelofs <newt@pobox.com>, <roelofs@users.sf.net>.

       This manual page was written by Kevin M. Rosenberg <kmr@debian.org> for the Debian GNU system (but may be
       used by others). Updated and converted to Perl POD source format 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                                           2023-06-20                                        pngcheck(1)