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Chapter 5. Color Settings: Configuring P... > Choosing a Gray Working Space

Choosing a Gray Working Space

Grayscale is a first-class citizen in Photoshop CS, with its own profiles independent of RGB or CMYK. However, note that grayscale profiles only contain tone reproduction information; they have no information about the color of the black ink or of the paper.

When Advanced Mode is turned off, you can choose among grayscale dot gains of 10, 15, 20, 25, or 30 percent, depending on your printing conditions. You can also choose either gamma 1.8 or 2.2, which are good choices for grayscale images destined for the screen. Of course, there's nothing to prevent you from using these gamma values for print images, or the dot gain curves for onscreen use, but generally speaking, gammas are designed for onscreen and dot gain curves are designed for print. Note that on the Macintosh platform, you can also choose the black channel of the ColorSync Default Profile for CMYK Documents, which is particularly useful if you print grayscale and color images in the same job.


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