Apple Motion 4 Instrukcja Użytkownika Pobierz pdf (Strona 323)

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Preserve Opacity is an easy way to selectively reveal part of an object. In this example,

by setting the blend mode of the top color wash layer to Exclusion, you get the resulting

image:

By selecting the Preserve Opacity checkbox for the color wash layer on top, only the

overlapping parts are displayed, and the superimposed image only affects the Dolphin

layer.

To turn on Preserve Opacity

Turn on an object’s Preserve Opacity checkbox in the Properties tab.

Using Blend Modes

Each of the available blend modes presents a different method for combining two or

more images together. Blend modes work in addition to an object’s alpha channel and

opacity parameter.

To understand the descriptions of each blend mode in this chapter, it’s important to

understand that blend modes mix colors from overlapping images together based on

the brightness values within each color channel in an image. Every image consists of red,

green, blue, and alpha channels. Each individual channel contains a range of brightness

values that define the intensity of each pixel in the image that uses some of the channel’s

color.

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