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I got into a heated discussion with a camera whiz kid from JB Hi-Fi today. The discussion was over the exposure compensation function on digital cameras and what exactly it did. When set to auto mode, Whiz Kid believed that turning the exposure compensation dial on a digital camera was a 'post' process. Just like fixing the levels in Photoshop, it did nothing to alter shutter speed and aperture settings. He believed it 'just made the screen brighter or darker.' I told him it wasn't a 'post' process at all. When shooting in auto mode, changing exposure compensation actually does alter either aperture or shutter speed settings. It's the only way an image can get darker or brighter besides changing the ISO.
If I had remembered to point out that an exposure compensation dial existed on film cameras long before digital cameras, Photoshop and this 'post' business I could have won the discussion right in the shop.
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