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Chapter 2. How Camera Raw Works > Brightness and Contrast

Brightness and Contrast

The Brightness and Contrast controls affect the rendering tone curve controlling the conversion from linear-gamma ProPhoto RGB to the final gamma-corrected output space. They work completely differently from the Photoshop controls that share their names—Photoshop's Contrast and Brightness. They behave similarly to Photoshop's Levels and Curves, respectively (Brightness is a gamma adjustment, Contrast is an S-curve) but with one important difference. The Camera Raw controls use an algorithm that preserves the original hue, whereas hard curve adjustments to the composite RGB curve in Photoshop can cause slight hue shifts.

If you make little or no adjustment with the Exposure slider, it's probably a wash as to whether you use Camera Raw's Brightness and Contrast sliders or make the adjustments post-conversion using Photoshop's tools.


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