NAME¶
pngmeta - extract metadata from Portable Network Graphics (PNG) image files
SYNOPSIS¶
pngmeta [
--soif] [
--html] [
--xrdf] [
--all]
[
--quiet] [
--uri URI] [
filename]
DESCRIPTION¶
The
pngmeta filter outputs the metadata from Portable Network Graphics
(PNG) format image files in one of these formats:
1. Simple key: value
2. SOIF format (as used by the Harvest system, version 1.4).
- As such it can be used as a Summarizer for the Harvest Essence system. It
could also be used by other indexers to extract data for indexing PNG
images.
3. HTML page With each element as an element in a descriptive (DL) list
4. XML/RDF With each element as an RDF property on the source URI.
In the absence of options, the program operates as a filter, accepting input
from stdin and sending output to stdout. If a single file name is given, it is
assumed to correspond to a PNG file, and is processed.
- --soif
- Format output using (Harvest) SOIF format. This is the default if the
program is called PngImage.sum.
- --html
- Format output in HTML, with each field/value as an element in a
descriptive (DL) list.
- --xrdf
- Format output in RDF/XML, with each field/value as an element in an
rdf:Description block inside the outer rdf:RDF wrapper element. If an
XMLRDFDATA field is found, it is assumed to be RDF/XML content and is
emitted in a second rdf:Description block.
OTHER OPTIONS¶
- --all
- Output all the information about the image size, depth etc. even if not
usually printed.
- --quiet
- Suppress the output of the banner for plain text output. --uri URI
Set the URI that is used for the SOIF and XML/RDF outputs. By default this
will be the filename, or "stdin" if this is the program is used
as a filter.
- --help
- Show a usage message
- --version
- Show the program and library versions
FILES¶
- pngmeta
- executable
SEE ALSO¶
gif2png(1),
libpng(3),
pbm(1),
pgm(1),
pngcheck(1),
pngtopnm(1),
pnm(5),
pnmgamma(1),
pnmtopng(1),
ptot(1),
tiff2png(1),
zlib(3)
For information about Harvest and its SOIF format:
- http://harvest.cs.colorado.edu/
For
PNG
- http://www.libpng.org/pub/png/
For
libpng library
- http://www.libpng.org/pub/png/libpng.html
http://libpng.sourceforge.net
For
zlib library
- http://www.zlib.net/
AUTHORS¶
Version 1.11. Dave Beckett, ILRT, University of Bristol,
http://purl.org/net/dajobe/
The
zlib(3) library required by
pngmeta is copyright (C) 1995-1996
Jean-loup Gailly and Mark Adler.
Original UNIX manual page by R. P. C. Rodgers, U.S. National Library of Medicine
(rodgers@nlm.nih.gov).
