[whatwg] [canvas] imageRenderingQuality property

Kristof Zelechovski giecrilj at stegny.2a.pl
Tue Jul 1 01:18:52 PDT 2008

The image rendering quality property is indeed unable to hit the tradeoff
between beauty of presentation and rendering speed.  However, it is
perfectly all right to say 'this content is some fancy GUI can be rendered
downscaled without degrading the content - but that content contains
engineering drawings that must be rendered as accurately as can be.'  This
is semantic information the browser has no way of inferring.

-----Original Message-----
From: whatwg-bounces at lists.whatwg.org
[mailto:whatwg-bounces at lists.whatwg.org] On Behalf Of Oliver Hunt
Sent: Tuesday, July 01, 2008 2:18 AM
To: Mark Finkle
Cc: Vladimir Vukicevic; Robert O'Callahan; WHATWG; David Hyatt; Jerason
Banes; Ian Hickson; Robert O'Callahan
Subject: Re: [whatwg] [canvas] imageRenderingQuality property

> So now we need to define levels of graphic burden? and at what level  
> of burden does the quality suffer? Seems just as hard to define.  
> Having the author explicit say "this has to be as high quality as  
> possible" or "less can be low quality" seems better and we have  
> examples of other specs offering the same kind of control.
No.  The whole point is that the UA is in the best position to  
identify what the tradeoffs are, not the author -- if you want a flag  
to specify the quality to be used then that would require you to  
determine what the tradeoffs were yourself, with no substantial  
knowledge of what combination any given user was actually using.  You  
need to realise that different UAs and different platforms have  
substantially different performance characteristics.

More information about the whatwg mailing list