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Adobe InDesign Help
Printing
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The following table lists the maximum line screens you can use with output devices and
still maintain all 256 levels of gray.
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 , and drag from the beginning point and the endpoint of
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.
Output Device Resolution
Maximum Line Screen
300
19
400
25
600
38
900
56
1000
63
1270
79
1446
90
1524
95
1693
106
2000
125
2400
150
2540
159
3000
188
3252
203
3600
225
4000
250
