Compressive images test

Compressive images[1][2]. I love the idea and fear it at the same time.

Love it because it would be oh so easy and awesome. Fear it because even if
the file size is smaller, I worry that a memory constrained UA would have
trouble decompressing images that contain four times the pixels.

I do not know if this is a rational fear or if I am simply depriving myself
of the chance at a long term retina image love.

So here's the question:

If we wanted to construct a test that would definitively answer whether or
not compressive images are safe to use or not, what would that test look
like?

-Jason

[1] http://filamentgroup.com/lab/rwd_img_compression/
[2] http://www.netvlies.nl/blog/design-interactie/retina-revolution


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