Autodesk 62205-051408-9001 User Guide - Page 643
Independent Color Suppression Operator, Adjusting Luminance Using Curves, Operator
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Adjusting Luminance Using Curves ❚❘❘ 3. Click Plot, and sample a pixel in the color spill. A vertical red line appears in the hue spectrum denoting the color that you sampled. 4. Choose a hue to replace the color spill: click the Hue Shift Target picker, and sample a color in the image. The color you picked appears in the Hue Shift Target color box. If you are not satisfied with the color, sample another color. 5. Specify the range of colors that you want to shift by raising the Hue Shift curve to 75.00 for that range. Shift the curve up to the 75% line to shift the source fully to the target hue. If you drag the curve to an intermediate point, the color shifts only partially around the color wheel and may give unexpected results. The color values in the image that fall in this range (inside the curve) are shifted to the hue shift target color. Note: Turn on Enable to apply changes made in the Color controls. Independent Color Suppression Operator You can access the same Color controls as in the Discreet Keyer by applying the Color Suppression operator. When you only want to suppress a color of a layer, you do not need all the other Keyer controls. To apply a Color Suppression operator: 1. In the Workspace panel, select a layer. 2. Choose Operators | Keying | Color Suppression. The Color Suppression Controls panel appears. Adjusting Luminance Using Curves When you create a matte for the front clip, the Keyer automatically creates a matte for the background to specify which part of the background is used for the composite. By default, the back matte is the inverse of the front matte. You can adjust the luminance of the front matte and back matte separately in the Curves controls. For example, you can increase the luminance of the back matte so that more of the back clip shows through at the edges of the key. This can create a better blend at the edges of the key. The following calculation is applied to each pixel of the image to create the composite. The calculation is applied in three passes, one each for the R, G, and B values of the front and back images, and the pixel is given the resulting R, G, and B values. Result = F x FrontLUT + B x BackLUT where: F = the R, G, and B values of the front image. B = the R, G, and B values of the back image. FrontLUT is the front matte pixel value, remapped according to any luminance curve change made in the Curves controls. The value is expressed as a decimal, where, for example, in 8-bit mode, 0 = 0, 127.5 = 0.5 and 255 = 1. BackLUT is the back matte pixel value, remapped according to any luminance curve change made in the Curves controls. The value is expressed as a decimal. 627
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