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pngcheck

NAME

pngcheck - Test PNG image files for corruption, and print size/type/compression info.         

SYNOPSIS

 pngcheck [-vqt7f] file.png [file.png [...]]

 pngcheck [-vqt7f] file.mng [file.mng [...]]

  ... | pngcheck [-sx][vqt7f]

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

DESCRIPTION

pngcheck 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 (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'').

OPTIONS

pngcheck accepts the following 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

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.