>> OK, that's just absurd. The sofa and the rug are *exactly* the same
>> colour. How the hell can the machine tell them apart? Additionally, how
>> on earth can it tell what colour they were originally? That's
>> impossible...
> 
> Except it clearly isn't impossible, because it was done.

Well yeah, OK, I rephrase: It defies explanation.

> Adjusting the white 
> balance of the photo involves picking out something that actually is/was 
> white (like the white on the baby's shirt).  That gives the computer a 
> reference to make the adjustments from.  When photos age, they tend to 
> age consistently and the colours adjust with consistency.  The computer 
> basically is doing an "undo" on the age effect applied by real life.

But surely no scanner on Earth has sufficient resolution that you can 
amplify a signal by many orders of magnitude and not be swamped by 
noise? The photo posted contains almost no blue whatsoever, so you'd 
have to apply a ridiculous amount of gain to that channel...

-- 
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