Autodesk 62205-051408-9001 User Guide - Page 636
Adding Softness, Click the Add Softness picker
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23 Keying Note: By default, the pixel that you sample is used to determine the key color in all the Keyer modes. If you want to sample different pixels in each Keyer mode, disable Lock. When you enable Lock again, the key color in all modes is reset to the key color in the current mode. All the pixels with the selected color value are keyed out of the front clip. 5. In the Output options, click Matte to view the matte. 6. Repeat these steps using the other color models, then view each of the resulting mattes to determine which color model gives the best result. Once you have decided on a color model, you can adjust the softness and tolerance ranges. Matte based on RGB Matte based on YUV Matte based on HLS Adding Softness The term softness refers to the semi-transparent area of the matte that creates a smooth transition between the foreground and background image. The softness range is the range of colors that are made semitransparent. At the center of the range, the colors are completely transparent. As you move away from the center, colors become less transparent. Typically you define a softness range as large as possible to remove all the blue or green from the front clip. But remember, if the range is too large, you will key out parts of the front subject. Setting the softness is an iterative process. You start by adding too much softness, then reduce it a little, increase it again, and so, on until you get just the right amount. When you cannot increase softness without losing edge definition or making holes in the matte, use other techniques such as color correction or matte curves to finish the key. These techniques are described in subsequent sections. Note: The multiple undos available in Combustion are useful when you are experimenting with different settings. Press CTRL+Z to undo a change. You can also click the Reset button to reset the Key controls to the default values. To adjust softness: 1. In the Keyer, click Key to access the softness controls. Note: Enable Feedback so that you can see the effect of the softness adjustments in the viewport as you work. 2. Do one of the following: Note: To access these options, you must select the RGB, YUV, HLS, or RGBCMYL Keyer mode. The Channel and Luma Keyer modes have different Keyer controls. • Set the Softness Offset. This changes the softness range by the same amount for every channel. • Click the Add Softness picker and drag the picker in the area that needs softening. The softness range expands to include the colors that you sampled. CTRL-drag to sample a rectangular area. 620
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