> 
> Different developers will have different priorities. HD image data and async 
> readback both have potential benefits in image quality and nonblocking 
> responsiveness respectively. Here is an example of an application using 
> getImageData which would clearly benefit from HD, but it's not obvious that 
> async would be useful:
> 
> http://mudcu.be/sketchpad/

This seems to be a use case for SVG and not canvas :)

Dirk

> 
> Here is another where HD helps but benefits of async are unclear, since it 
> does a pixel read-write-modify cycle:
> 
> http://nerget.com/pressure/pressure.html
> 
> Tying HD to async may hurt the adoption of both by requiring developers to 
> take two different code change hits when they only care about one. In 
> particular, the async change is likely to be more invasive to code structure. 
>  If developers are discouraged, they may end up using neither. Thus, in my 
> opinion, these two enhancements to ImageData should stand and fall on their 
> own merits.
> 
> Regards,
> Maciej
> 
> 
> 
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