pngcheck - Man Page

• Print a summary for an image (width, height, and color depth): pngcheck image.png
• Print information for an image with [c]olorized output: pngcheck -c image.png
• Print [v]erbose information for an image: pngcheck -cvt image.png
• Receive an image from stdin and display detailed information: cat path/to/image.png | pngcheck -cvt
• [s]earch for PNGs within a specific file and display information about them: pngcheck -s image.png
• Search for PNGs within another file and e[x]tract them: pngcheck -x image.png

tldr.sh

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

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.

-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

MNG support is more informational than conformance-oriented.

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

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