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).
