Linked by Thom Holwerda on Sun 16th Sep 2007 12:59 UTC, submitted by anonymous
Graphics, User Interfaces "The HTML file that contains all the text for this article is about 25000 bytes. That's less than one of the image files that was also downloaded when you selected this page. Since image files typically are larger than text files and since web pages often contain many images that are transmitted across connections that can be slow, it's helpful to have a way to represent images in a compact format. In this article, we'll see how a JPEG file represents an image using a fraction of the computer storage that might be expected. We'll also look at some of the mathematics behind the newer JPEG 2000 standard."
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RE: Why?
by ValiSystem on Sun 16th Sep 2007 17:24 UTC in reply to "Why?"
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jpeg2k guarantees a lossless compression, which result of compressed files at an average 50% of original file size. This is the guaranteed lossless, there is a security margin. So that a 40% of original file size, you may have totally invisible information loss. At 10% of the original file size, the naked eye may notice some encodings artifacts without comparing to original. 5% of original file size is a good ratio for interchange (not storage). Why pay for 500GB hard drive if you can have the same storage on 250GB, thanks to the software magic ?

jpeg2k won't emerge soon because it's heavily patented, but it's a great technology.

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