PNGINFO(1)

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).