Please create an account to participate in the Slashdot moderation system


Forgot your password?

Submission Summary: 0 pending, 2 declined, 0 accepted (2 total, 0.00% accepted)

DEAL: For $25 - Add A Second Phone Number To Your Smartphone for life! Use promo code SLASHDOT25. Also, Slashdot's Facebook page has a chat bot now. Message it for stories and more. Check out the new SourceForge HTML5 Internet speed test! ×

Submission + - Mozilla and JPEG2000: any possibility? (

Rogerio Brito writes: "Perceptual encoding of audio (like Vorbis, MP3, and AAC), images and video (like Theora) is one of the most popular ways to compress data, providing a balance between file sizes and what humans perceive as "verisimilar".

The current JPEG format, widely used by almost every page to show "potographic" images (and many other applications) shows poor compression rates while a given "quality ratio" is specified. Also, it performs poorly when low "quality ratios" are selected.

The JPEG2000 format is a more efficient format based on Wavelet Transforms rather than Discrete Cosine Transforms to compress data. The "quality ratios" can be selected very low and the images still show good quality, among many other features that JPEG does not have (like being a lossy compression format with support for transparency).

(As a side note, you can check which image formats your browser supports at

There are implementations of the JPEG2000 format that are Free/Libre Open Souce but not widely used. The perceived reason for this has the nature of a "chicken-and-egg" problem: no browsers support it (apart from Apple's Safari, with the use of Quicktime), and no users have still employed it, leading to little support in browsers.

There is a very long-lived bug in Mozilla's bugzilla system (almost a decade ago) that asked support for the "new" file format to be supported.

Yesterday, this long-standing feature request was closed with the "WONTFIX" tag, citing the the "chicken-and-egg" problem. This has caused many replies from both the developer and user community, and even a comment from Mark Shuttleworth stating "We'd consider a patch for the Ubuntu builds of Firefox." and Mike Hommey, one of the principal maintainers of Iceweasel for Debian."


Submission + - Debian adopts time-based releases

Rogério Brito writes: "The Debian Project is well known for having long development cycles, which has, split the opinions of users with those that prefer a stable, reliable release, and those that want newer features (including support for hardware that was sold after the stable version of the distribution). While the development cycles of Debian were mostly driven by the "it's ready when it is ready" philosophy, the project has decided to adopt time-based relases, with the duration of 2 years, freezing the distribution at December of each odd-numbered year and releasing the distribution in the beginning of the next year."

Slashdot Top Deals

Technological progress has merely provided us with more efficient means for going backwards. -- Aldous Huxley