Apple MA434Z/A User Manual - Page 713

operator Each button that appears in the group of controls labelled "operator" allows you to modify the key created by Primatte, using a color you select with the Color control. The effect of all the operators you click is cumulative, and each operation you perform is saved in a history of operations that's accessible via the currentOp slider. Every time you click an operator, an additional operation is added to the history of operations represented by the currentOp slider. To modify the currently selected operation, instead of adding a new one, select an operation using the currentOp slider, click the color control bearing that operation's name, then scrub the image to select a new color range. The eight operator buttons include the following: • background: Assigns pixels to the background. Areas of the foreground that you select with the background operator become100-percent transparent, with no spill suppression. • restore detail: Removes transparency on background material. It is useful for restoring lost details such as hair. It is the equivalent of detailTrans in the "fine tuning" subtree, but with no slider. • fine tuning: When the fine tuning mode is clicked, three additional parameters appear at the bottom of the Parameters tab. • spillSponge: When this mode is selected, the pointer motion in the Decolor slider performs a color adjustment of the sampled color against the background. After sampling a color region from the image, the more to the right the pointer moves, the less of the background color component (or spill) is included in that color region. The more to the left the pointer moves, the closer the color component of the selected region is to the spill suppress color. • fgTrans: Adjusts the transparency of the matte against the sampled color. After sampling a color region from the image, the more to the right the pointer moves, the more transparent the matte becomes in that color region. This is equivalent to the "make fg trans" button, but offers more control. • detailTrans: Determines the transparency of the sampled color when it is close to the background color. The slider in this mode is useful for restoring the color of pixels that are faded due to similarity to the background color. If you slide to the left, picked areas are more opaque. This is equivalent to the "restore detail" button, but offers more control. • foreground: When this mode is selected, the sampled pixels within the image window become 100 percent foreground. The color of the sampled pixels is the same color as in the original foreground image. The matte is completely white. • make fg trans: Allows you to select regions within foreground elements in order to make them more transparent. This operation is used to adjust elements like clouds or smoke. It is the equivalent of the fgTrans conrol in fine tuning mode, except that it features no slider control. Chapter 24 Keying 713