To specify the dot gain using curves:

1 Print a hard proof with calibration bars included. (See "Setting output options" on page 473.)

2 Using a reflective densitometer, take a reading at one or more marks of the printed calibration bar.

3 In the Custom CMYK dialog box, for Dot Gain, choose Curves.

4 In the lower right of the Dot Gain Curves dialog box, select the ink plate for which you want to set dot gain curves. To set the same curves for all the plates, select All Same.

5 Do one of the following:

• Enter the values of your densitometer readings in the text boxes.

For example, if you have specified a 30% dot, and the densitometer reading is 36%, you have a 6% dot gain in your midtones. To compensate for this gain, enter 36% in the 30% text box.

• Click to add an adjustment point in the dot gain curve, and drag the point to change its value. The value then appears in the appropriate text box.

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