Adobe 25510629 User Guide - Page 39

Selects which channel is active for adjustment through the Level, Offset

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NOTE Processing mode options: Pre-Processing: For the input clip, adjusts colors before the input clip is keyed. You should limit Pre-processing adjustments to the input clip to changes that enhance the color of the background and allow better keying. You should perform all other color correction for this layer by using the Post-Processing controls. For more information, see "Improving a background in the input clip" on page 77. For layers other than the input clip, the distinction between pre-processing and postprocessing is irrelevant because Ultra performs no processing on these layers that is comparable to the keying performed on the input clip. Therefore, all color correction is performed by using this set of controls. If pre-processing color corrections are made, you may need to readjust the keyer settings, because they will affect the material being keyed. It is best to perform preprocessing color correction prior to setting and adjusting a key. Post-Processing: Applies to the input clip only. Changes made in this mode affect the color of the subject after keying. You can make these changes either to offset a preprocessing color correction that adversely changed the color of the subject or to balance the appearance of the subject with the appearance of the background and virtual set. Brightness: Controls the intensity of luminance in the currently active source. Contrast: Controls the degree of separation of light and dark shades in the currently active source. Saturation: Controls the intensity of color in the current active source. Hue: Controls the balance of colors used in the current active source. All Channels: When selected, any changes that you make to the Level, Offset, and Gamma controls affect all of the color channels. When deselected, the options for Red, Green, and Blue are available. Red, Green, and Blue: Selects which channel is active for adjustment through the Level, Offset, and Gamma controls. These options are available only when the All Channel check box is deselected. Level: Adjusts the value of the current color channel on the 0-255 scale for all pixels that have a nonzero value in the current channel. Offset: Adjusts the value of the current color channel on the 0-255 scale for all pixels, regardless of whether they originally had a value in the current channel. Gamma: Differentially adjusts the value of the current color channel on the 0-255 scale, with the degree of change greatest if the original value was in the middle of the range and diminishing to nothing for values at the extremes. User interface 39

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User interface
39
Processing mode options:
Pre-Processing: For the input clip, adjusts colors before the input clip is keyed. You
should limit Pre-processing adjustments to the input clip to changes that enhance the
color of the background and allow better keying. You should perform all other color
correction for this layer by using the Post-Processing controls. For more information, see
“Improving a background in the input clip” on page 77
.
For layers other than the input clip, the distinction between pre-processing and post-
processing is irrelevant because Ultra performs no processing on these layers that is
comparable to the keying performed on the input clip. Therefore, all color correction is
performed by using this set of controls.
Post-Processing: Applies to the input clip only. Changes made in this mode affect the
color of the subject after keying. You can make these changes either to offset a pre-
processing color correction that adversely changed the color of the subject or to balance
the appearance of the subject with the appearance of the background and virtual set.
Brightness:
Controls the intensity of luminance in the currently active source.
Contrast:
Controls the degree of separation of light and dark shades in the currently active
source.
Saturation:
Controls the intensity of color in the current active source.
Hue:
Controls the balance of colors used in the current active source.
All Channels:
When selected, any changes that you make to the Level, Offset, and Gamma
controls affect all of the color channels. When deselected, the options for Red, Green, and
Blue are available.
Red, Green, and Blue:
Selects which channel is active for adjustment through the Level,
Offset, and Gamma controls. These options are available only when the All Channel check
box is deselected.
Level:
Adjusts the value of the current color channel on the 0-255 scale for all pixels that have
a nonzero value in the current channel.
Offset:
Adjusts the value of the current color channel on the 0-255 scale for all pixels,
regardless of whether they originally had a value in the current channel.
Gamma:
Differentially adjusts the value of the current color channel on the 0-255 scale, with
the degree of change greatest if the original value was in the middle of the range and
diminishing to nothing for values at the extremes.
NOTE
If pre-processing color corrections are made, you may need to readjust the keyer
settings, because they will affect the material being keyed. It is best to perform pre-
processing color correction prior to setting and adjusting a key.