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 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.