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

       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.

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

       MNG support is more informational than conformance-oriented.

-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

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

pngcheck 3.0.3                                     April 2021                                        PNGCHECK(1)

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