NAME

       pngchunks - print information embedded into a PNG file

SYNOPSIS

        pngchunks

DESCRIPTION

       pngchunks  is  a  program  that  displays informations from files created according to the
       Portable Network Graphics file format.

EXAMPLE

              pngchunks input.png Chunk: Data Length 13 (max 2147483647), Type 1380206665 [IHDR]
                Critical, public, PNG 1.2 compliant, unsafe to copy
                IHDR Width: 256
                IHDR Height: 256
                IHDR Bitdepth: 8
                IHDR Colortype: 2
                IHDR Compression: 0
                IHDR Filter: 0
                IHDR Interlace: 0
                IHDR Compression algorithm is Deflate
                IHDR Filter method is type zero (None, Sub, Up, Average, Paeth)
                IHDR Interlacing is disabled
                Chunk CRC: -753909967 Chunk: Data Length 6 (max 2147483647), Type 1145523042 [bKGD]
                Ancillary, public, PNG 1.2 compliant, unsafe to copy
                ... Unknown chunk type
                Chunk CRC: 554438993 Chunk: Data Length 9 (max 2147483647), Type 1935231088 [pHYs]
                Ancillary, public, PNG 1.2 compliant, safe to copy
                ... Unknown chunk type
                Chunk CRC: -757235972 Chunk: Data Length 7 (max 2147483647), Type 1162692980 [tIME]
                Ancillary, public, PNG 1.2 compliant, unsafe to copy
                ... Unknown chunk type
                Chunk CRC: 429243611 Chunk: Data Length 831 (max 2147483647), Type 1413563465 [IDAT]
                Critical, public, PNG 1.2 compliant, unsafe to copy
                IDAT contains image data
                Chunk CRC: 1406256926 Chunk: Data Length 0 (max 2147483647), Type 1145980233 [IEND]
                Critical, public, PNG 1.2 compliant, unsafe to copy
                IEND contains no data
                Chunk CRC: -1371381630

SEE ALSO

       pngchunkdesc(1), pngcp(1), pnginfo(1).

VERSION

       This documentation was generated for pngtools 0.2 by autodocbook (http://www.stillhq.com).

AUTHOR

       pngtools is under development by Michael Still (mikal@stillhq.com). All code is  Copyright
       Michael  Still  2001  to  2003,   and  is released under the GNU GPL. Code submissions are
       welcomed. Contact Michael at the address above if you have something  you  would  like  to
       contribute.

BUGS

       There   are  no  known bugs in pngtools. If you find one, please contact mikal@stillhq.com
       and let me know.

                                         31 January 2023                             PNGCHUNKS(1)