Adobe INDESIGN 2.0 - USING HELP Help Manual page 404

Adobe InDesign Help
Using Help | Contents
The following table lists the maximum line screens you can use with output devices and
still maintain all 256 levels of gray.
Output Device Resolution
300
400
600
900
1000
1270
1446
1524
1693
2000
2400
2540
3000
3252
3600
4000
Calculating the maximum gradient length based on the
color change
InDesign calculates the number of steps in a gradient based on the percentage of change
between the colors in the gradient. The number of steps, in turn, determines the
maximum length of the gradient before banding occurs.
The gradient's number of steps and maximum length assume that you are printing the file
with a line screen and resolution that produce 256 levels of gray.
To determine the maximum gradient length based on the color change:
1 Select the line tool
the gradient.
2 On a piece of paper, note the distance displayed in the Transform palette. This distance
represents the length of the gradient.
3 Calculate the number of steps in the gradient by dividing the number of grays by the
percentage change in color.
To determine the percentage change in color, subtract the lower color value from the
higher color value. For example, a gradient between 20% black and 100% black is an
80%—or 0.8—change in color.
Using Help | Contents
| Index
Maximum Line Screen
19
25
38
56
63
79
90
95
106
125
150
159
188
203
225
250
, and drag from the beginning point and the endpoint of
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Printing
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