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)