On Fri, 25 Jul 2008 11:13:52 +0100, Phil Cook wrote:

> And lo on Thu, 24 Jul 2008 20:31:59 +0100, Jim Henderson
> <nos### [at] nospamcom> did spake, saying:
> 
>> On Thu, 24 Jul 2008 20:24:51 +0100, Orchid XP v8 wrote:
>>
>>>>> I meant you can't just give a machine a BW picture of a tree and
>>>>> have it automatically know to turn it green. That's impossible.
>>>>
>>>> I don't know that to be the case.  Again, a case of one's ability to
>>>> fathom how something like that is done doesn't translate to "there's
>>>> no way it could possibly be done".
>>>
>>> It's a basic premise of signal processing that you cannot recover data
>>> that isn't there any more. Shannon's theorum and all that.
>>>
>>> Whether you can *fake* something that "looks" right is another matter.
>>> But *recover*? No. Impossible.
>>
>> At least as far as we know today.
> 
> If the grains in the film reacted to colour in some currently unreadable
> fashion and/or those alterations were transferred to the photo itself
> then you could, in theory, recover colour from a B&W photo or film by
> reading those imperfections.

That's kinda what I'm thinking.

Jim

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