NAME

       pnginfo - display information on the PNG files named

SYNOPSIS

        pnginfo [-t] [-d] [-D] <filenames>

DESCRIPTION

       This  command  dumps  information  about  the  PNG  files  named on the command line. This
       command's output is based on the output of the tiffinfo command,  which  is  part  of  the
       libtiff distribution. Each line output by the command represents a value that has been set
       within the PNG file.

       The -t command line option forces pnginfo to use libtiff tiffinfo style labels, instead of
       the  more relevant png names. The -d command line option dumps the bitmap contained by the
       image to standard out, whilst the -D command merely checks that the image bitmap could  be
       extracted from the file. If nothing is reported by -D, then there was no error.

       The format for the output bitmaps is hexadecimal, with each pixel presented as a triple --
       for instance [red green blue]. This means that paletted images et cetera will  have  their
       bitmaps expanded before display.

RETURNS

       0 success

       1 error

EXAMPLE

       pnginfo -t toucan.png basn3p02.png basn6a16.png toucan.png...
        Image Width: 162 Image Length: 150
        Bits/Sample: 8
        Samples/Pixel: 1
        Pixel Depth: 8
        Colour Type (Photometric Interpretation): PALETTED COLOUR with alpha (256 colours, 256 transparent)
        Image filter: Single row per byte filter
        Interlacing: Adam7 interlacing
        Compression Scheme: Deflate method 8, 32k window
        Resolution: 0, 0 (unit unknown)
        FillOrder: msb-to-lsb
        Byte Order: Network (Big Endian)
        Number of text strings: 0 of 0

       basn3p02.png...
        Image Width: 32 Image Length: 32
        Bits/Sample: 2
        Samples/Pixel: 1
        Pixel Depth: 2
        Colour Type (Photometric Interpretation): PALETTED COLOUR (4 colours, 0 transparent)
        Image filter: Single row per byte filter
        Interlacing: No interlacing
        Compression Scheme: Deflate method 8, 32k window
        Resolution: 0, 0 (unit unknown)
        FillOrder: msb-to-lsb
        Byte Order: Network (Big Endian)
        Number of text strings: 0 of 0

       basn6a16.png...
        Image Width: 32 Image Length: 32
        Bits/Sample: 16
        Samples/Pixel: 4
        Pixel Depth: 64
        Colour Type (Photometric Interpretation): RGB with alpha channel
        Image filter: Single row per byte filter
        Interlacing: No interlacing
        Compression Scheme: Deflate method 8, 32k window
        Resolution: 0, 0 (unit unknown)
        FillOrder: msb-to-lsb
        Byte Order: Network (Big Endian)
        Number of text strings: 0 of 0

SEE ALSO

       tiffinfo(1) pngchunkdesc(1) pngcp(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                               PNGINFO(1)