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.