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Re: Adaptive images

From: Simon Pieters <simonp@opera.com>
Date: Wed, 01 Jun 2011 12:14:03 +0200
To: "Tab Atkins Jr." <jackalmage@gmail.com>, "Maciej Stachowiak" <mjs@apple.com>, "Leonard Rosenthol" <lrosenth@adobe.com>
Cc: "Henri Sivonen" <hsivonen@iki.fi>, "Karl Dubost" <karld@opera.com>, "public-html@w3.org" <public-html@w3.org>
Message-ID: <op.vwd6ppb3idj3kv@simon-pieterss-macbook.local>
On Wed, 01 Jun 2011 11:18:22 +0200, Leonard Rosenthol <lrosenth@adobe.com>  

>> What about when the user zooms in on the image with an iPhone 3G?  
>> Wouldn't the user want the sharper image >then?
> Yes, you might indeed...
>>> I don't think any solution along the lines of "read from server and
>>> stop early" cuts it either, because latency is high on modern cellular
>>> networks in proportion to the bandwidth, so if I cut off the server
>>> connection early, my incoming bandwidth has already been wasted.
>> Sure. On the other hand, if you need to load first a small image and  
>> then the large image when the user zooms in, >you will have wasted even  
>> more.
> True - but ONLY if the user zooms.  And you don't know ahead of time if  
> the user will do that :(.

Indeed. However, with the stop early approach you can stop with very low  
resolution for all images if the user starts in overview view, and then  
only load more when the user zooms into "normal" zoom view for images that  
are in view, which I would expect would save more bandwidth compared to  
author-supplied "normal res" and "high res" dual images.

Simon Pieters
Opera Software
Received on Wednesday, 1 June 2011 10:14:51 UTC

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