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 lables, 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

       Nothing.

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

       pngchunkdesc(1), pngchunks(1), pngcp(1),

AUTHOR

       pnginfo was written by Michael Still <mikal@stillhq.com>.

       This manual page was written by Nelson A. de Oliveira <naoliv@debian.org>, for the  Debian
       project (but may be used by others).

                                 Tue, 31 Jul 2007 17:55:51 -0300                       PNGINFO(1)