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Chapter 8. Understanding Colors and Channels > Understanding the Lab Color Mode

Understanding the Lab Color Mode

The Lab color mode is an old color measuring system. Created in France in 1939, its purpose was to measure color based on visual perception. Since computers were not around in 1939, the Lab model is not based on a particular computer or operating system, and so Lab color is device independent. Lab measures color using a lightness channel, an “a” channel (red to green), and a “b” channel (blue to yellow). Lab works well for editing images obtained from Photo CD's, moving images between operating systems (Photoshop Mac to Photoshop Win), and for printing color images to a PostScript Level 2 or 3 device.

Convert an Image to Lab Color

Open an image.

Click the Image menu, point to Mode, and then click Lab Color.

Photoshop converts the image into the Lab color mode.


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