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>.