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Opacity Masks

Opacity masks use the luminosity of the uppermost object to produce a transparent pattern on lower objects. When the masking object is filled with a solid color, the mask is uniform. If the luminosity is high (bright colors), the mask appears to have little or no effect. If the masking object is filled with a dark color, the artwork below appears more transparent. When the masking object is filled with a pattern or a gradient, the results can vary substantially. Figure 17.9 compares opacity masks created with gradient and pattern fills.

Figure 17.9. The interaction between the patterns of the top-most rectangles (the opacity masks) and the underlying objects depends on the lightness or brightness of the opacity mask's color.



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