>> ...in other words, you're not changing the exposure (i.e., the number of
>> seconds that the shutter opens) at all, you're simulating it.
> 
> In consumer cameras that show the image on the LCD screen all the time, 
> there is no "shutter opening for N milliseconds". The sensor is getting 
> light all the time.

Sure. But when you take an image, it integrates the sensor output for 
the duration of X seconds. You can't unintegrate it, or reintegrate over 
a different time period, for example. (Unless you got it to shoot a few 
trillion RAW images and save them all...)

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