Invisible wrote:
> scott wrote:
>> However pros use the raw sensor data from the camera and not a JPEG.
>> This allows them some margin to adjust the exposure later without adding
>> any artifacts to the final JPEG image they create.  Because of this it
>> is extremely important not to saturate the sensor (ie 100% white) in any
>> areas, it is impossible to get back detail in areas that are at 100%.
>> If you under-expose it you can scale up the brightness without
>> introducing artifacts (because usually the raw sensor data is higher bit
>> depth than JPEG).
> 
> ...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.

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