February 18, 2005

Gracefully downgrading

Question: does WebKit automatically downgrade graphics based on your connection speed?
I'm traveling this afternoon and catching up on my RSS subscriptions whilst chatting via GPRS. All the images that NetNewsWire is downloading appear to be low-quality jpgs ... where usually they would be normal quality. Is WebKit really that smart?

Posted by savs at February 18, 2005 1:29 PM
Comments

I've observed exactly this effect many times with safari. I can only assume it does exactly what you speculate -- I can't see any other way that this could happen. I can't remember much about the JPEG format, but I assume it starts with low frequency cosines, and works to higher ones (i.e. low detail to hi detail), and so you can 'get away' with chopping the stream early if you get bored. That said, I also remember image being split into 'blocks', which would kinda prohibit just 'chopping' the stream half-way through. Hmm.

P.

Posted by: Paul Russell at February 19, 2005 10:48 AM

hi, i noticed you said about the mime type for 3gp on apache id be really thank full if you know the correct type to add i dont seem to be able to get it to work, only just got jar/jad to work, if know plz could you email me and tell me plz

venusdiablo_b@hotmail.com

Posted by: Bernard at March 4, 2005 2:13 PM