This is the command pnginfo that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
PROGRAM:
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
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