Autodesk 62205-051408-9001 User Guide - Page 243

Using Channel Effects ❚❘❘ dimensions differ from the front layer's, the matte layer is scaled so the two layers match. To use the Set Matte effect: 1. Select the layer to which you want to apply a matte (the layer whose transparency you want to modify). 2. Choose Operators | Channel | Set Matte. The Set Matte Controls panel appears. To use the Switcher: 1. Select the layer to which you want to apply the Switcher. 2. Choose Operators | Channel | Switcher. The Switcher controls panel appears. 3. Click the Layer button, and then select the operator to use as a matte from the Operator Picker dialog. 4. From the Input Channel list, select which channel in the matte layer sets the alpha channel of the other layer. For example, select Luminance to set alpha to zero where pixels are black, and to 100 where pixels are white. 5. Use Undefined Areas to specify the color used to fill in the blank (0% opacity) areas of the image. To do this, click the Pick button to select a color from the viewport, or click the color box to choose a color from the color picker. 6. Set the Blend value to a value below 100% to partially see through to the original layer. 3. Click Add Input. The Select Source dialog appears. 4. Select the operator that you want to add as an input to the Switcher. The operator selected is used as the main input. Using Switcher Use Switcher to change a layer's operator and keep the original operator. You can add multiple inputs to the Switcher and choose which input you want to use as the main input. 227