Adobe Illustrator CS3 Manual do Utilizador descarregar pdf (Página 422)

100

101

ILLUSTRATOR CS3

User Guide

416

See also

“Printer resolution and screen frequency” on page 402

“Change the printer resolution and screen frequency” on page 403

Calculate the maximum blend length for gradients

Illustrator 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 blend before banding occurs.

1 Select the Measure tool , and click the beginning point and the endpoint of the gradient.

2 Note the distance displayed in the Info panel on a piece of paper. This distance represents the length of the

gradient or color blend.

3 Calculate the number of steps in the blend using this formula:

Number of steps = 256 (number of grays) X Percentage change in color

To figure out the percentage change in color, subtract the lower color value from the higher color value. For example,

a blend between 20% black and 100% black is an 80%—or 0.8—change in color.

When blending process colors, use the largest change that occurs within any one color. For instance, take a blend

from 20% cyan, 30% magenta, 80% yellow, and 60% black to 20% cyan, 90% magenta, 70% yellow, and 40% black.

This indicates a 60% change, because the greatest change occurs in magenta—from 30% to 90%.

4 Using the number of steps calculated in step 3, see if the length of the gradient is larger than the relevant

maximum length indicated in the next chart. If it is, reduce the length of the gradient or change the colors.

3252 203

3600 225

4000 250

Number of Steps

Adobe

Illustrator

Recommends

Maximum Blend Length

Points Inches Cms

10 21.6 .3 .762

20 43.2 .6 1.524

30 64.8 .9 2.286

40 86.4 1.2 3.048

50 108.0 1.5 3.810

60 129.6 1.8 4.572

70 151.2 2.1 5.334

80 172.8 2.4 6.096

90 194.4 2.7 6.858

Final Imagesetter Resolution Maximum Line Screen

to Use

1 2 ... 417 418 419 420 421 422 423 424 425 426 427 ... 494 495

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