.TH PNGCHECK "1" "January 2021" "pngcheck 3.0.2" "User Commands"
.SH NAME
pngcheck \- tests PNG, JNG or MNG image files for corruption, and prints size/type info.
.SH SYNOPSIS
.B pngcheck
.RI [ \-7cpqtv ]
.I file.{png|jng|mng}
.RI [ file2.{png|jng|mng} \ [...]]
.br
.RB ...\ |\  pngcheck
.RI [ \-7cpqstvx ]
.br
.B pngcheck
.RI [ \-7cpqstvx ] \ file-containing-PNGs ...
.SH DESCRIPTION
PNGcheck, version 3.0.2 of 31 January 2021,
by Alexander Lehmann, Andreas Dilger and Greg Roelofs.
.PP
Test PNG, JNG or MNG image files for corruption, and print size/type info.
.SH OPTIONS
.TP
.B \-7
print contents of tEXt chunks, escape chars >=128 (for 7\-bit terminals)
.TP
.B \-c
colorize output (for ANSI terminals)
.TP
.B \-p
print contents of PLTE, tRNS, hIST, sPLT and PPLT (can be used with
.BR \-q )
.TP
.B \-q
test quietly (output only errors)
.TP
.B \-s
search for PNGs within another file
.TP
.B \-t
print contents of tEXt chunks (can be used with
.BR \-q )
.TP
.B \-v
test verbosely (print most chunk data)
.TP
.B \-vv
test very verbosely (decode & print line filters)
.TP
.B \-w
suppress windowBits test (more\-stringent compression check)
.TP
.B \-x
search for PNGs within another file and extract them when found
.SH NOTE
MNG support is more informational than conformance\-oriented.
.SH "SEE ALSO"
.BR pngsplit (1),
.BR png-fix-IDAT-windowsize (1)