A note on contrast adjustments: Contrast works in a way similar to bright/dark. What it does is remove a certain percentage of the possible tonal levels. say 5% from each edge. It then spreads out what's left in the space of values. Resulting in tonal 'jumps'. Never, ever adjust contrast in an image if you can help it. If you have Photoshop use curves. If you can adjust Gamma with your video card, do so.

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