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Contrast is a dual action where upon increasing, the brights get brighter and the darks get darker. Black and white have a mid point which is gray. When you increase contrast, the darks and lights become darker and lighter in opposition. When contrast is decreased, the darks and lights reverse in opposition (become less opposed).
Brightness is a single action where upon increasing, both the brights and darks get brighter, and upon decreasing, both the brights and darks get darker.
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