On Wed, 05 May 2010 21:04:31 +0100, Orchid XP v8 wrote:

> Jim Henderson wrote:
>> On Wed, 05 May 2010 12:35:02 +0200, scott wrote:
>> 
>>> And typically pros will not let the camera do *any* processing, and
>>> import the raw sensor data to their computer for manual colour,
>>> sharpness and exposure control.
>> 
>> Exactly - the adjustments I made were pretty basic with GIMP (similar
>> to the ones you made), but if RAW format images were available, there'd
>> be a lot more room to adjust things like exposure.
> 
> ...but once the image has been taken, the exposure has already happened.
> How can you change it after the fact?

I've actually wondered this myself - raw editing software gives you the 
option to adjust the exposure; obviously, you can't pull details out 
doing this that are completely washed out or completely underexposed, but 
it is possible to bring additional detail out by making changes to the 
exposure setting (ev) after the photo has been taken.

I've done it, so clearly it's possible, I just don't understand the math 
behind it.

Jim

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