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The camera’s light meter may recommend an aperture and shutter combination that offers a decent exposure. However, it may not give you the perfect exposure because it doesn’t know what you’re photographing. Light meters can’t evaluate colors or contrast. They only see luminance, which is the brightness of the reflected light in a scene. Chapter 2 How Digital Images Are Displayed 31 Cameras with sophisticated light meters can be set to meter, or test, specific areas of the scene. Most DSLRs allow you to choose the portion of the viewfinder to meter.

However, color temperature refers to the color value of the light rather than its heat value. Light’s color temperature is measured in units called kelvin (K). This temperature scale measures the relative intensity of red to blue light. Warmer light—light that tends to cast an orangish-red tint across the image—has a lower temperature. Neutral or balanced light occupies the midranges, and has no effect on the image’s color values because of its white qualities. Cooler light—light that is blue in appearance—has a higher temperature.

1 bit 2 possible values 2 bits 4 possible values 4 bits 16 possible values 8 bits 256 possible values Formats like JPEG use 24 bits per pixel: 8 bits for the red channel, 8 bits for the green channel, and 8 bits for the blue channel. An 8-bit color channel can represent 256 possible values (28), while three 8-bit color channels can represent 16,777,216 values (224). RAW image files also use three color channels. Because most RAW files have the capacity to capture 12 to 14 bits per color channel, their range of colors is exponentially larger.

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