NAME

pngcheck - tests PNG, JNG or MNG image files for corruption, and prints size/type info.

SYNOPSIS

pngcheck [-7cpqtv] file.{png|jng|mng} [file2.{png|jng|mng} [...]]
... | pngcheck [-7cpqstvx]
pngcheck [-7cpqstvx] file-containing-PNGs...

DESCRIPTION

PNGcheck, version 3.0.3 of 25 April 2021, by Alexander Lehmann, Andreas Dilger and Greg Roelofs.

Test PNG, JNG or MNG image files for corruption, and print size/type info.

OPTIONS

-7

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

-c

colorize output (for ANSI terminals)

-p

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

-q

test quietly (output only errors)

-s

search for PNGs within another file

-t

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

-v

test verbosely (print most chunk data)

-vv

test very verbosely (decode & print line filters)

-w

suppress windowBits test (more-stringent compression check)

-x

search for PNGs within another file and extract them when found

NOTE

MNG support is more informational than conformance-oriented.

SEE ALSO

pngsplit(1), png-fix-IDAT-windowsize(1)