The total of your image when you put it in is 100 by using a total of more than 100 you are adding extra brightness to the image. This maybe ok for some images but is best not to because you could easily end up overdoing it and clipping a channel and losing detail without realising at the time.

If you do it in levels after or curves after you can see exactlty what you are doing and are far less likely to lose detail. PS: Good advice from Jim there :) PPS Most consumer cameras will have very similar focal plane shutters. Message edited on: 05/16/2005 16:43

And every one said, 'If we only live,
We too will go to sea in a Sieve,---
To the hills of the Chankly Bore!'
Far and few, far and few, Are the lands where the Jumblies live;
Their heads are green, and their hands are blue, And they went to sea in a Sieve.

Edward Lear
http://www.nonsenselit.org/Lear/ns/jumblies.html