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Topic: PNG

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In the News (Sat 26 May 18)

  PNG - Wikipedia, the free encyclopedia
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.
Version 1.0 of the PNG specification was released on July 1, 1996, and later appeared as RFC 2083.
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/PNG   (2947 words)

 Portable Network Graphics (PNG) Specification (Second Edition)
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)

 Benefits of the PNG Image Format
The PNG format was developed when it was discovered by the entire development community in early 1995 that the GIF image format uses LZW compression, technology which was patented in 1985 by Unisys corporation.
The images on the left are the original PNG's, the images in the middle are JPEG's that were created from the original PNG overlayed onto a background, and the images on the right are JPEG's that were created from the original PNG and overlayed onto the same background as the table.
PNG interlacing (formally known as Adam 7) begins by only reading a small percentage of all the data and filling in the empty spaces with an interpolated color value.
www.atalasoft.com /PNG.aspx   (1309 words)

 [No title]
PNG is designed to work well in online viewing applications, such as the World Wide Web, so it is fully streamable with a progressive display option.
PNG permits multi-sample pixels only with 8- and 16-bit samples, so multiple samples of a single pixel are never packed into one byte.
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).
www.ietf.org /rfc/rfc2083.txt   (13123 words)

 Portable Network Graphics
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)

 A List Apart: Articles: Cross-Browser Variable Opacity with PNG: A Real Solution
When PNG appeared on the scene, web designers were ready to make the switch to the free, superior format and shun GIF forever.
Whereas PNG supports alpha transparency, GIF only supports binary transparency, which is a big limitation and has a couple of important implications.
The PNG home site, for instance, talks about a few other obscure browsers that should support alpha transparency, but that haven’t been verified yet.
www.alistapart.com /articles/pngopacity   (2205 words)

 PNG Tips for Cartoonists
PNG compression is lossless, which means that unlike JPEGs, there is no degradation of image quality when you save a cartoon.
PNG is an Open Source image format, so you can use it however you want.
PNG's transparency is actually more flexible and powerful than GIF's, but unfortunately, this is not yet handled consistently in all browsers and platforms.
hackles.org /etc/png.html   (1952 words)

 Webopedia: JPG vs. GIF vs. PNG
PNG was developed as a patent-free answer to the GIF format but is also an improvement on the GIF technique.
An image in a lossless PNG file can be 5%-25% more compressed than a GIF file of the same image.
PNG builds on the idea of transparency in GIF images and allows the control of the degree of transparency, known as opacity.
www.webopedia.com /DidYouKnow/Internet/2002/JPG_GIF_PNG.asp   (479 words)

 To PNG or not to PNG | evolt.org   (Site not responding. Last check: 2007-10-21)
PNG is royalty free, unlike GIF, and is a recommendation of the W3C.
Below are screen captures of the PNG created in Photoshop from major browsers to illustrate the wide disparity in gamma correction for PNG.
PNG can be a great format but it all depends on how it is used.
www.evolt.org /article/To_PNG_or_not_to_PNG/22/60134   (3705 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 Support in Internet Explorer for Windows (MSIE): Challenges and Workarounds   (Site not responding. Last check: 2007-10-21)
PNGs were introduced to replace GIFs, perhaps in part due to patent issues with the GIF format.
A transparent PNG is not dependent on the background color of a web page to look good, but adapts to whatever background you put it on.
This is evidenced by the lack of widespread PNG use (because if you don't use the alpha channel transparency, there's little point in using a PNG over another image format).
people.brandeis.edu /~peelle/png   (997 words)

 DataCompression.info - PNG   (Site not responding. Last check: 2007-10-21)
PNG was created in response to the decision by Unisys to begin demanding royalties from produces of products that support the GIF file format.
PNG is designed to be royalty free, primarily by virtue of the fact that it uses the free zlib engine to compress image data.
Note that the source code for this book includes an independent implementation of a PNG codec, which may be one of a kind.
datacompression.info /PNG.shtml   (1937 words)

 PNG-Tech: Technical Issues regarding the PNG File Format
PNG uses ZLIB streams [RFC1950] as compressed datastreams.
PNG compression does not depend only on the image statistics, but it may vary within large limits, depending on several compression parameters.
The Deflate compression used by PNG is superior to the LZW compression used by GIF.
www.cs.toronto.edu /~cosmin/pngtech   (487 words)

 US-CERT Technical Cyber Security Alert TA04-217A -- Multiple Vulnerabilities in libpng
As a result, a PNG image with excessive height may cause an integer overflow during a memory allocation operation, which could cause the affected application to crash.
In the case of VU#388984, an attacker with the ability to introduce a malformed PNG image to a vulnerable application could cause the application to crash or could potentially execute arbitrary code with the privileges of the user running the affected application.
In the case of VU#236656 and VU#160448, an attacker with the ability to introduce a malformed PNG image to a vulnerable application could cause the application to crash.
www.us-cert.gov /cas/techalerts/TA04-217A.html   (558 words)

 AFL PNG :: pure AFL . . . purely Papua New Guinea
AFL PNG is the representative of the AFL in PNG
AFL PNG has seen blossoming opportunities for their young players since the program began in 2002, but especially in 2005 through the formalisation of closer links with AFL Queensland.
The PNG Mosquitoes are still seeking sponsorship support for the International Cup Tour and anyone interested in joining with a PNG team that is a very good chance to be World Champions should call Scott Reid on 323 0444.
www.afl-png.com   (726 words)

 PNG - The Professional Numismatists Guild
The PNG is a nonprofit organization composed of the world's top rare coin and paper money experts.
PNG members are strictly forbidden to sell coins/currency that has been mis-represented in ANY way.
The combined membership of PNG has sold hundreds of millions of dollars in rare coins and currency, as well as contributed to the hobby by writing dozens of reference books on a wide variety of topics.
www.pngdealers.com   (277 words)

 PNG (Portable Network Graphics) Home Site   (Site not responding. Last check: 2007-10-21)
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   (1195 words)

 PNG transparency test
To determine how your browser handles PNG transparency, find the images on the right that look the most similar.
There's a petition (at PetitionOnline) for proper PNG support in IE for Windows.
I am aware that MSIE 5.5+ for Windows supports an "AlphaImageLoader" filter that can be used to display PNG images with transparency.
entropymine.com /jason/testbed/pngtrans   (663 words)

 Papua New Guinea Business Directory and Tourism Information
PNG's leading online "Business and Tourism Directory" is looking for enthusiastic freelance journalists wishing to contribute, Business and Travel News, Current Affairs or articles of general interest on PNG or the Pacific Islands.
As a PNG based company, we pride ourselves in the fact that our treks are led by proud PNG guides and porters.
A young Dutch couple has made history in the PNG adventure tourism arena by being the first to undertake a difficult Ramu River canoeing expedition combined with a trek to Simbai in Madang’s highlands.
www.pngbd.com   (1278 words)

 IEBlog : IE7 Transparent PNG Implementation
I also have the MSN premium client on my machine which seems to render the PNG files ok when the DPI is set to 120 (although the PNG's are still the "original" size and not scaled up with the rest of the items on the screen).
I modified the CSS to serve PNGs instead of GIFs to IE and all of the PNGs were correctly alpha blending.
PNG Alpha Transparency in IE55, IE6 is already supported when used in VML (Vector Markup Language Elements).
blogs.msdn.com /ie/archive/2005/04/26/412263.aspx   (7364 words)

 What is PNG? - A Word Definition From the Webopedia Computer Dictionary
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.
It is maintained by Group 42, Inc., a contributor to the PNG effort.
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   (301 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)

 Proper PNG Support in Internet Explorer for Windows Petition
The PNG image format was designed to be a replacement for the GIF format, due to both copyright and design problems with GIF.
The PNG format is a World Wide Web Consortium (W3C) recommendation: Microsoft has repeatedly stated their renewed commitment to web standards, so implementing full PNG support would be the next logical step in fulfilling this promise, especially since it was supposed to be implemented over four years ago.
The Proper PNG Support in Internet Explorer for Windows Petition to the Microsoft Internet Explorer for Windows Development Team was created by webmasters and web designers and written by Aaron Adams.
www.petitiononline.com /msiepng/petition.html   (428 words)

 Services | PNG White Pages Directory   (Site not responding. Last check: 2007-10-21)
Results are limited to 256 records so choose your criteria wisely.
To dial a PNG number from another country <> 675 <PNG number>> e.g.
Telikom PNG Limited recommends using Internet Explorer V6.0 or better @ 1024x768 +.
www.telikompng.com.pg /WhiteDirectories.aspx   (90 words)

 kaourantin.net: PNG Encoder in AS3
It implements a simple PNG encoder, taking a BitmapData as input and returns the encoded PNG as a ByteArray which you can then process further, f.ex.
The main reason that this is trivial to do in AS3 is a 'little' feature in ByteArray which allows you to compress data using zlib.
You could also supply an extra parameter to the method to specify what type of data you are giving it, e.g.
www.kaourantin.net /2005/10/png-encoder-in-as3.html   (1283 words)

 PNG in Windows IE   (Site not responding. Last check: 2007-10-21)
This site is all about a JavaScript-based PNG fix for Internet Explorer 5.5 and 6 on Windows.
If you want to get straight to the script, go to the how-to page and follow the instructions there.
Because Windows IE versions prior to 5.5 do not support the filter which fixes the PNG problem, and version 7 (not yet released at the time of writing in January 2006) is reported to have fixed the issue entirely.
homepage.ntlworld.com /bobosola   (198 words)

 PNG Encoder   (Site not responding. Last check: 2007-10-21)
Thus, this PNG encoder creates PNGs with a color type of 2 (that is, RGB triples) and a bit depth of 8, optionally encoding alpha channel information.
You may see a sample program which draws an clock face and saves it in an appropriately named file.
Information from the PNG Specification was immensely useful in developing this code.
www.catcode.com /pngencoder   (425 words)

 Papua New Guinea info on PNG research level books, articles on PNG and educational information on PNG - BUAI digital ...
I.D.R.C. PNG BUAI seeks to provide a virtual home for a growing collection of research level electronic material on and from Papua New Guinea.
PNG BUAI is sponsored under the IDRC's PAN initiative
PNG Atomz.com provided increased Search Service quota for PNGbuai.com in 2003.
www.pngbuai.com   (370 words)

 LIBPNG   (Site not responding. Last check: 2007-10-21)
This is an open source project to develop and maintain the reference library for use in applications that create and manipulate PNG (Portable Network Graphics) raster image files.
UPDATE 20 August 2004: In the rush to get libpng-1.2.6 out to solve the vulnerability described below, a bug was introduced that causes almost all PNG output files to be written with incorrect zlib header bytes.
This site belongs to the PNG Development Group and is maintained for the group by Glenn Randers-Pehrson glennrp@users.sourceforge.net
libpng.sourceforge.net   (214 words)

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