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Topic: Portable Network Graphics

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	Portable Network Graphics (Site not responding. Last check: 2007-11-07)
		PNG is an extensible file format for the lossless, portable, well-compressed storage of raster images.
		Viewers for PNG are available on many platforms; there are an increasing number of content creation tools available; and thus modern browsers implement support for it also.
		The official PNG home page is maintained by Greg Roelofs and includes a frequently updated listing of Web browsers that support PNG (including plug-ins), helper applications, and content creation tools (both interactive editors and conversion tools).
	www.w3.org /Graphics/PNG (350 words)

	PNG - Portable Network Graphics
		Portable Network Graphics - a graphics file format invented to replace the inferior GIF format that is now heavily restricted by a senseless patent held by Unisys.
		Portable Network Graphics format is similar to the GIF format, and was created as a result of a licensing dispute over the GIF format compression routine.
		Portable Network Graphic image format (pronounced 'ping') is designed as a replacement for GIFs with several major advantages.
	www.auditmypc.com /acronym/PNG.asp (813 words)

	RFC 2083 (rfc2083) - PNG (Portable Network Graphics) Specification Version
		Deflate-compressed datastreams within PNG are stored in the "zlib" format, which has the structure: Compression method/flags code: 1 byte Additional flags/check bits: 1 byte Compressed data blocks: n bytes Check value: 4 bytes Further details on this format are given in the zlib specification [RFC-1950].
		PNG allows the encoder to supply a suggested palette in a PLTE chunk, but not all encoders will do so, and the suggested palette may be unsuitable in any case (it may have too many or too few colors).
		PNG text is not supposed to contain any characters outside the ISO 8859-1 "Latin-1" character set (that is, no codes 0-31 or 127- 159), except for the newline character (decimal 10).
	www.faqs.org /rfcs/rfc2083.html (17992 words)

	Portable Network Graphics (PNG) Specification (Second Edition) (Site not responding. Last check: 2007-11-07)
		PNG decoders are strongly encouraged to use this information, plus information about the display system, in order to present the image to the viewer in a way that reproduces as closely as possible what the image's original author saw.
		PNG standardizes one filter method and several filter types that may be used to prepare image data for compression.
		PNG compression method 0 is deflate/inflate compression with a sliding window (which is an upper bound on the distances appearing in the deflate stream) of at most 32768 bytes.
	www.w3.org /TR/PNG (10571 words)

	Cover Pages: W3C and ISO Publish Final Version of Portable Network Graphics (PNG) Specification.
		PNG is a lossless format, which means that when the image is decompressed, the exact original pixel values are preserved.
		PNG graphics also support true color in addition to indexed color, whereas only the latter is supported by GIF (so GIF is lossy for truecolor images).
		PNG, since it is now mature and very widely implemented, has gone through the process of ISO standardization and has become a W3C Recommendation.
	xml.coverpages.org /ni2003-11-26-a.html (1277 words)

	PNG - Wikipedia, the free encyclopedia
		PNG (Portable Network Graphics) is a bitmap image format that employs lossless data compression.
		PNG was created to both improve upon and replace the GIF format with an image file format that does not require a patent license to use.
		PNG is a better choice than JPEG for storing images that contain text, line art, or other images with sharp transitions that do not transform well into the frequency domain.
	en.wikipedia.org /wiki/Portable_Network_Graphics (3196 words)

	PNG (Portable Network Graphics) Specification, Sixth Draft (Site not responding. Last check: 2007-11-07)
		Excerpts may be printed with the following notice: "excerpted from the PNG (Portable Network Graphics) specification by Thomas Boutell." No notice is required in software that follows this specification; notice is only required when reproducing or excerpting from the specification itself.
		The PNG format is intended to provide a portable, legally unencumbered, simple, lossless, streaming-capable, well-compressed, well-specified standard for bitmapped image files which gives new features to the end user at minimal cost to the developer.
		PNG has been expressly designed not to be completely dependent on a single compression technique.
	sunhe.jinr.ru /docs/w3c/Graphics/PNG/png-spec6.html (3654 words)

	Group 42: PNG Info
		Portable Network Graphics (PNG) was created in response to the GIF licensing debacle and is optimized for graphics use on the Internet and other on-line services.
		PNG supports image depths up to 24-bit and provides a better lossless compression than that found in GIF files.
		PNG has been accepted as an image standard by the WWW Consortium and is slowly being integrated into the major web browsers including Netscape and Internet Explorer.
	www.group42.com /png.htm (203 words)

	PNG (Portable Network Graphics) Specification
		PNG also uses zlib datastreams in iTXt, zTXt, and iCCP chunks, where the remainder of the chunk following the compression method byte is a zlib datastream as specified above.
		PNG editors must give up on encountering an unknown critical chunk type, because there is no way to be certain that a valid file will result from modifying a file containing such a chunk.
		PNG allows the encoder to supply suggested palettes, but not all encoders will do so, and the suggested palettes may be unsuitable in any case (they may have too many or too few colors).
	pmt.sourceforge.net /specs/png-1.2-pdg-h20.html (18854 words)

	PNG (Portable Network Graphics) Specification
		PNG text is not supposed to contain any characters outside the ISO 8859-1 "Latin-1" character set (that is, no codes 0-31 or 127-159), except for the newline character (decimal 10).
		We also use it to emphasize that a PNG image might be generated and consumed "on the fly", never appearing in a stored file at all.
		PNG also permits an alpha sample to be stored for each pixel of a grayscale image.
	www.whisqu.se /per/docs/png.htm (18274 words)

	ProVisors - The Professionals Network Group (Site not responding. Last check: 2007-11-07)
		ProVisors is a network of over 800 top professionals whose firms represent clients ranging from local owner operated businesses to global, multi-billion dollar businesses.
		PNG has a specific strategy for growing and strengthening groups in order to improve the value of PNG to all of its members.
		The key element of that strategy involves a targeted effort to recruit new members into the organization that fit the profile that we have found to contribute to and receive the most value from PNG.
	www.png.org (238 words)

	PNG (Portable Network Graphics) Home Site
		Note that the PNG home site has moved four times since 1995 (though the URL has changed only three times, and hopefully never again).
		PNG (pronounced "ping") is the Portable Network Graphics format, a format for storing bitmapped (raster) images on computers.
		PNG also supports things like suggested quantization, "smart" extensibility, a standard color space and lots of other excellent stuff, but let us leave all that aside for now.
	www.libpng.org /pub/png (1215 words)

	Portable Network Graphics
		It is a very nice program (VuePrint (aka PhotoVue Plus)) by Hamrick Software, and I have suggested to Ed Hamrick that he add PNG support.
		It is a win-32 (95/98/NT) application which supports a wide variety of graphic formats.
		It supports over 23 graphics formats, many multimedia formats, has a great slideshow capability, and can generate image catalogs.
	r0k.us /graphics/pngBase.html (462 words)

	What is PNG? - A Word Definition From the Webopedia Computer Dictionary (Site not responding. Last check: 2007-11-07)
		Short for Portable Network Graphics, and pronounced ping, a new bit-mapped graphics format similar to GIF.
		In fact, PNG was approved as a standard by the World Wide Web consortium to replace GIF because GIF uses a patented data compression algorithm called LZW.
		The PNG home page offers a set of reference pages for locating code and information related to the PNG image format.
	www.webopedia.com /TERM/P/PNG.html (204 words)

	Portable Network Graphics -- from Mathematica Information Center
		The PNGBitmap package reads and writes Portable Network Graphics bitmaps into the kernel of Mathematica.
		The Display[] function is modified to save PNG bitmaps with Display[file, graphics,"PNG"].
		The output can be read by many graphics programs and Web browsers, and the images can be used as image and texture maps for POVRay.
	library.wolfram.com /infocenter/MathSource/2661 (107 words)

	Build Your Own Nuclear Bomb Effects Computer
		You'll need to be able to print graphics (ideally in colour) from images in PNG (Portable Network Graphics) format with a specified and consistent scale.
		The rotating discs of the bomb computer must be printed on clear plastic with white areas of the image left clear.
		Even though you tell the software to centre the image on the page, you may find that the front and back sides are consistently misaligned; the two centre marks are offset identically in every print attempt.
	www.fourmilab.ch /bombcalc/brico.html (1585 words)

	PNG Delphi
		This is the official page for PNG Delphi component, a complete/free/source code library to read Portable Network Graphics images in Delphi/Object Pascal.
		Although it was not tested, it might work with other pascal implementations.
		Can read all the images from the official PNG test suite (see showcase 2).
	pngdelphi.sourceforge.net (257 words)

	SourceForge.net: Portable Network Graphics in Ch
		The Ch PNG package is a Ch interface to the PNG C library.
		Ch PNG enables all functions in the PNG library to run in Ch interpretively without compilation.
		It is ideal for teaching and learning PNG file manipulation programming.
	sourceforge.net /projects/chpng (120 words)

	libpng.org: top level (Site not responding. Last check: 2007-11-07)
		(the free reference library for reading and writing PNGs)
		Different parts of it are mirrored in various locations around the world; see the PNG and MNG home pages for details.
		There is also a completely separate site for the free MNG library,
	www.libpng.org (42 words)

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