Autodesk 62205-051408-9001 User Guide - Page 242
Using RGB Arithmetic, Using Set Matte, The RGB Arithmetic Controls panel includes
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9 Working with Image Channels The Minimax Controls panel contains the following elements. Horizontal Radius-Determines the horizontal distance from each pixel the effect takes into account. Vertical Radius-Determines the vertical distance from each pixel the effect takes into account. Method-Sets the type of effect applied to the pixels. The following Methods are available. Use Minimum Maximum Min then Max Max then Min To Compare the value of pixels within the range of the radius sliders and set those pixels to the minimum value in the range. This has the effect of shrinking bright areas and expanding dark ones. Compare the value of pixels within the range of the radius sliders and set those pixels to the maximum value in the range. This has the effect of expanding bright areas and shrinking dark ones. Apply a minimum operation within the specified radius then apply a maximum operation within the same radius in a second pass. Apply a maximum operation within the specified radius then apply a minimum operation within the same radius in a second pass. Using RGB Arithmetic Use RGB Arithmetic to apply specific mathematical operations to the Red, Green, and Blue channels. All channels have an individual Operator list and Operand slider for specifying settings independently. To apply an RGB Arithmetic filter: 1. Select the layer. 2. Choose Operators | Channel | RGB Arithmetic. The RGB Arithmetic Controls panel appears. The RGB Arithmetic Controls panel includes the following elements. Operator-Specifies which mathematical operation is applied to the specified channel. For a complete list of options, see Operator List Options. Operators are available for Red, Green, and Blue. Operand-Specifies the intensity of the selected operator for the specified channel. The effect depends on the mathematical operator specified, but in most cases, 0% applies no mathematical operations, while 100% is full intensity of the selected Operator. Operands are available for Red, Green, and Blue. Blend-Specifies the percentage amount for which the channel effect is visible over the original layer. Values below 100% allow you to see the original layer. Using Set Matte Use Set Matte to use one operator (footage or any other operator) as the alpha channel for another. The Set Matte effect makes it easy to use one layer to modify several layers in the composite. For example, you can use the alpha channel from a keyed image to modify several layers by applying a Set Matte effect to each layer whose transparency you want to modify. Note: Transformations to the layer that you are using as the matte layer are disregarded. If the matte layer's 226
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