Autodesk 62205-051408-9001 User Guide - Page 218
Using Preserve Alpha, Negative, Saturation, Colorize, Luminance, Fully Additive Mix, Gray Luma
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8 Using Surface Properties Negative-Inverts the colors of the current layer wherever it overlaps other layers behind it. Hue-Changes the hue of the current layer to the hue of the layers behind it. This effectively makes the current layer take on the "tint" of the elements in the background of the composite. Saturation-Changes the saturation of the current layer to the saturation values of the layers behind it. (This differs from Saturate, which uses the saturation of the current layer to increase that of the layers behind it.) Colorize-Changes the hue and saturation of the current layer to the hue and saturation values of the layers behind it. Luminance-Changes the luminance of the layers in the background of the composite to the luminance value of the current layer. Fully Additive Mix-Adds non-opaque pixels of the current layer to the layers behind it, but composites opaque pixels normally. This transfer mode is useful for some keying operations to get a slightly cleaner edge against the background. Gray (Luma)-Displays the current layer in grayscale wherever it overlaps other layers behind it. The gray calculation is based on the luminance of the current layer. Gray (HSV)-Displays the current layer in grayscale wherever it overlaps other layers behind it. The gray calculation is based on the HSV colorspace value of the current layer. Shade-Uses the current layer to "shade" layers behind it. The hue and saturation of the current layer are used, but the value of the background elements is retained. This looks as if the current layer is taking on the "texture" of the background elements wherever they overlap. Saturate-Uses the saturation of the current layer to increase the saturation of the layers behind it. (This differs from Saturation, which equalizes the saturation of the current layer with that of the layers behind it.) Desaturate-Uses the saturation of the current layer to decrease the saturation of the layers behind it. Behind-Hides the current layer behind the alpha channel of the current composite, without moving it or changing its stacking order in the Timeline list. Exclusion-Creates an effect similar to Difference, but lower in contrast and resulting in a grayer image. The layer order is not significant, as both layers contribute nearly equally to the result. Color Dodge-Uses the color information in each channel of the current layer to brighten the layer behind it. The order of the layers effects the result- the underlying layer stands out more. Color Burn-Uses the color information in each channel of the current layer to darken the layer behind it (the opposite of Color Dodge). Using Preserve Alpha Preserve Alpha uses the alpha value of the layer underneath it. To use Preserve Alpha for the current layer: 1. Select the layer. 2. In the Surface controls, click the Preserve Alpha button. For 2D composites, this option is in the Layer controls. If Preserve Alpha is enabled, the current layer appears only where another layer is visible, using the other layer's opacity value. 202
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