porsche isnt really a amazeing machine in my eyes but a lambo is (lambogini = super bull)
[spoiler]The Story of PNG actually begins way back in 1977 and 1978 when two Israeli researchers, Jacob Ziv and Abraham Lempel, first published a pair of papers on a new class of lossless data-compression algorithms, now collectively referred to as ``LZ77'' and ``LZ78.'' Some years later, in 1983, Terry Welch of Sperry (which later merged with Burroughs to form Unisys) developed a very fast variant of LZ78 called LZW. Welch also filed for a patent on LZW, as did two IBM researchers, Victor Miller and Mark Wegman. The result was...you guessed it...the USPTO granted both patents (in December 1985 and March 1989, respectively).
Meanwhile CompuServe--specifically, Bob Berry--was busily designing a new, portable, compressed image format in 1987. Its name was GIF, for ``Graphics Interchange Format,'' and Berry et al. blithely settled on LZW as the compression method. Tim Oren, Vice President of Future Technology at CompuServe (now with Electric Communities), wrote: ``The LZW algorithm was incorporated from an open publication, and without knowledge that Unisys was pursuing a patent. The patent was brought to our attention, much to our displeasure, after the GIF spec had been published and passed into wide use.'' There are claims [1] that Unisys was made aware of this as early as 1989 and chose to ignore the use in ``pure software''; the documents to substantiate this claim have apparently been lost. In any case, Unisys for years limited itself to pursuit of hardware vendors--particularly modem manufacturers implementing V.42bis in silicon.
All of that changed at the end of 1994. Whether due to ongoing financial difficulties or as part of the industry-wide bonk on the head provided by the World Wide Web, Unisys in 1993 began aggressively pursuing commercial vendors of software-only LZW implementations. CompuServe seems to have been its primary target at first, culminating in an agreement--quietly announced on 28 December 1994, right in the middle of the Christmas holidays--to begin collecting royalties from authors of GIF-supporting software. The spit hit the fan on the Internet the following week; what was then the comp.graphics newsgroup went nuts, to use a technical term. As is the way of Usenet, much ire was directed at CompuServe for making the announcement, and then at Unisys once the details became a little clearer; but mixed in with the noise was the genesis of an informal Internet working group led by Thomas Boutell [2]. Its purpose was not only to design a replacement for the GIF format, but a successor to it: better, smaller, more extensible, and FREE.
The Early Days (All Seven of 'Em)
The very first PNG draft--then called ``PBF,'' for Portable Bitmap Format-- was posted by Tom to comp.graphics, comp.compression and comp.infosystems.www.providers on Wednesday, 4 January 1995. It had a three-byte signature, chunk numbers rather than chunk names, maximum pixel depth of 8 bits and no specified compression method, but even at that stage it had more in common with today's PNG than with any other existing format.
Within one week, most of the major features of PNG had been proposed, if not yet accepted: delta-filtering for improved compression (Scott Elliott and Mark Adler); deflate compression (Tom Lane, the Info-ZIP gang and many others); 24-bit support (many folks); the PNG name itself (Oliver Fromme); internal CRCs (myself); gamma chunk (Paul Haeberli) and 48- and 64-bit support (Jonathan Shekter). The first proto-PNG mailing list was also set up that week; Tom released the second draft of the specification; and I posted some test results that showed a 10% improvement in compression if GIF's LZW method was simply replaced with the deflate (LZ77) algorithm. Figure 1 is a timeline listing many of the major events in PNG's history.[/spoiler]
[spoiler]HISTORY OF JPEG
The DCT is the transform used in JPEG compression. "Joint Photographic Experts Group" is the original name of the committee that created the JPEG format. The standard was a joint effort by three of the world's largest standards organizations: The International Organization for Standardization (ISO), the International Telegraph and Telephone Consultative Committee (CCITT), and the International Electrotechnical Commission (IEC). The JPEG project began back in 1982. The goal was to create a data compression standard that would display an image within one second down a 64 Kbits/sec ISDN line. Eventually, the format would be able to send loss-less images. The standard was intended for natural, real world scenes. It was designed to compress natural pictures that are smooth and curved and have no jagged edges.
The project began under ISO as Working Group 8 but later merged with CCITT. The Joint Photographic Experts Group, actually a subcommittee of ISO, was then formed in 1986 in order to avoid competing standards among the three standards organizations. After testing of numerous schemes, the Adaptive Discrete Cosine Transform (DCT) was chosen to be the core of the JPEG format. Three years later, the merged ISO/IEC committee gave their approval to make the JPEG the standard. It was drafted as the ISO Committee Draft 10918 or Digital Compression and Coding of Continuous-Tone Still Images. It was officially standardized as the International Standard ISO 10918-1.
JPEG has been in existence for nearly a decade. Revisions updating JPEG to make use of our current text-based technologies are in progress. This project has been in progress since August 1998. The project team isdeveloping a JPEG format that provides more compression options and better images which take up the same amount of space. It is said that the core of
JPEG 2000 is Wavelet technology. The release date has been set for January
2000, but implementation will probably take some time.[/spoiler]
jpeg can take advantage of text conscripts mentioned in the history which png cant, also png increases the image simply because the way it compressions.
i like jpg's when i need fast compressed images and need them quickly i love png's becuase the quality but the compression takes a bit more time tho now adays with duo core processing and quad core processing the time isnt even noteable but back in the day when hdd's only held 40megs of space this is what jpg and png was ment for.
sorry im not clear on boths historys since its been a while, but honestly if ur dealing with low space and image quality dosent matter jpeg is the way
if you need medium spaced quick compressed interlaced quality images PNG is ur freind.
http://info.eps.surrey.ac.uk/FAQ/standards.html
dont know it if is the work that block or??
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