W3C home > Mailing lists > Public > public-respimg@w3.org > September 2013

Re: Compressive images test

From: Marcos Caceres <w3c@marcosc.com>
Date: Tue, 17 Sep 2013 15:50:32 +0100
To: Barry Latimer <blat001@gmail.com>
Cc: Andy Davies <dajdavies@gmail.com>, "public-respimg@w3.org" <public-respimg@w3.org>
Message-ID: <61B74F2F13B643A3AAFF42ED5DB22BFE@marcosc.com>
Hi Barry, 

On Tuesday, September 17, 2013 at 3:15 PM, Barry Latimer wrote:

> All,
> While its really interesting to understand how different image formats compress and byte boundaries work, it seems to be a different topic than responsive images and the ideal implementation method, as using optimal or non-optimal compression techniques to serve different images to a different breakpoints/screen sizes/screen formats should result in different image sizes therefore reducing/increasing the overall download size of a page depending upon the chosen image.
I'm sorry, but I have to disagree. Much of the pushback that we got originally from browser vendors was "compress your images better, then!". In particular, the community group was pointed to: 

if we are able to show that scaling down giant images (regardless of them having low kilobytes) simply won't scale memory-wise - that's a pretty big deal.  
> The focus here needs to be more around which techniques will best work for the wider community on specifying a format/syntax to indicate to the browser which image to download based upon the screen/user/device viewing the web page in question.

Sure, that is just one of our problems - but the CG is interested in _all_ aspects of image delivery. For instance, we are also extremely interested in evaluating how Client-Hints could help (which is a HTTP-based solution, rather than a markup solution). 

In other words, the problem of effective responsive image delivery is not confined to syntax and formats. It involves looking at a range of problems that affect different layers of the platform (from network, to markup, to the preload scanner, to decompression speed, to memory usage, etc.)

Kind regards,

Marcos Caceres
Received on Tuesday, 17 September 2013 14:51:04 UTC

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