Autodesk 62205-051408-9001 User Guide - Page 626
Keyer Mode, Key Color, Tolerance Controls, controls in RGB, YUV, HLS, and RGB-CMYL
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23 Keying Key controls (not including the Tolerance and Softness fields, and sliders) The Key controls vary depending on the mode you select.The following section describes the Key controls in RGB, YUV, HLS, and RGB-CMYL modes. For information on the Key controls in channel mode, see Extracting a Single Color. For information on the Key controls in Luma mode, see Extracting a Key Based on Luminance. Keyer Mode The Keyer Mode list determines the color model used for extracting a matte from the key-in image. RGB-Defines a range of colors to be keyed out using the red, green, and blue channels of the image. YUV-Builds a key using the luminance and chrominance channels of the image. HLS-Builds a key using the hue, luminance, and saturation channels of the image. Channel-Extracts pure red, green, or blue from the image. You can also select a custom color, which is useful if the front clip includes transparencies, shadows, or reflections. RGBCMYL-Builds a key using the red, green, blue, cyan, magenta, yellow, and luminance channels of the image. This color model offers sub-pixel resolution. Luma-Builds a key according to the clip's luminance values. This mode is useful for clips with high contrast or filmed against a black background. Key Color Sets the color to be keyed out. To set the key color, click the picker, move the cursor over the Keyer or Composite viewport and do one of the following: • Click a point to sample a single color. • Click and drag the cursor to use the average of the pixels sampled. • Press CTRL while you click and drag the cursor. A rectangular selection box surrounds the sampled pixels. The key color is set to the average of the pixels inside the selection box. The key color appears in the Key Color box. Enable Lock to use the same key color when comparing Keyer modes. Disable Lock if you want to sample different pixels for each Keyer mode. Tolerance Controls Sets the range of colors to be keyed out. Do any of the following: • To reset the tolerance limit to a color, click Set Tolerance, and then sample the color in the viewer. • To extend the tolerance range to include a color, click the Add Tolerance picker, and then sample the color in the image. CTRL-drag the cursor over a region to key out all the pixels inside the selection box. To perform detailed adjustments, you can zoom into the image and sample colors at the pixel level. • To shrink the range so that a color is excluded, click the Remove Tolerance picker, and then sample the color in the image. • To change the tolerance by the same amount for all the channels, adjust the Tolerance Offset field. 610
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