pngcheck(1) Utils pngcheck(1)NAMEpngcheck - Test PNG image files for corruption, and print
size/type/compression info.
SYNOPSISpngcheck [-vqt7f] file.png [file.png [...]]
pngcheck [-vqt7f] file.mng [file.mng [...]]
... | pngcheck [-sx][vqt7f]
pngcheck -{sx}[vqt7f] file-containing-PNGs...
DESCRIPTIONpngcheck verifies the integrity of PNG, JNG and MNG files (by checking
the internal 32-bit CRCs or checksums) and optionally dumps almost all
of 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'').
OPTIONSpngcheck accepts the following options:
-v
test verbosely (print most chunk data)
-q
test quietly (only output errors)
-
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
AUTHOR
This man page was written by Kevin M. Rosenberg <kmr@debian.org> since
the upstream package did not include a man page.
NOTES
MNG support is incomplete. Based on MNG Draft 64.
Kevin M. Rosenbergpngcheck(1)
