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Getting Started with Camera Raw: How to make better pictures using Photoshop and Photoshop Elements, Second Edition by Ben Long

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Camera Theory: Understanding Linear Capture

Chapter 2 touched briefly on the fact that your eye and your camera respond to light levels in very different ways. If you double the amount of light being shined at your camera, then your camera will record a 100 percent increase in illumination. Because a camera’s response to light is directly proportional to the intensity of the light source, we say that it has a linear response to light.

Your eyes don’t work this way. Your eyes are much more responsive to subtle variations in bright and dark tones than they are to changes in mid-tones. In other words, their response to light is not directly proportional to the intensity of the light source in question. Thus, we say that your eyes have a nonlinear ...

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