pngcheck1
Tests png, jng or mng image files for corruption, and prints size/type info.
Usage
pngcheck [-7cpqstvx]
file-containing-PNGs ...
Overview
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.
Releases
11 releases since Debian 3.1 (Sarge); the text changed 5 times.
-c since Debian 11 (Bullseye);
-vv since Debian 11 (Bullseye);
-w since Debian 11 (Bullseye).
-f until Debian 10 (Buster).