Safari on MacBook Air showing graphics in 16-bit colour

Hi all,
On my MacBook Air system, graphics that appear in Safari show up as this (here's a small sample):
In particular, look at the mirroring under the image... it's streaky, indicative of 32-bit-to-16-bit colour conversion.
Is there a setting on Safari that can force it to display graphics in 32-bit colour? The MacBook Air's Display settings don't offer anything with regards to setting a display depth:
Any technical details about this issue would be most welcome! It's not a problem for me, but it is noticable in some Web pages.
Incidentally, Firefox 8 also does this too, but running apps like OmniGraffle Pro:
shows good colour graphics (32-bit).
Is this something that the graphics controller is doing?! For Safari and Firefox to use different rendering engines and produce the same results in rendering images with 16-bit graphics is rather perplexing!
Or... is this Lion's doing?! I am running Safari 5.1.2 and Firefox 8.0.1 on Lion 10.7.2.
Cheers!
—tonza

I finally found what was going on with my MacBook Air... turns out it has nothing to do with the machine at all. Instead it was because I was using a 3G connection in order to get to the Internet.
My mobile phone provider was using a proxy server which reduced the size of images by re-rendering them on the fly in order to reduce bandwidth on the 3G network! So all those graphics artifacts were caused by my mobile phone provider!
If my MacBook Air uses another Internet connection (like WiFi) on another provider, the problem disappears!
—tonza

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Safari on MacBook Air showing graphics in 16-bit colour

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