.| KeyMix |
Function
The KeyMix function mixes two images together through the specified channel
of a third image. You can control the mix percentage, and also invert the
masking image. KeyMix and Over are the two primary compositing nodes—KeyMix for unpremultiplied images and Over for premultiplied images. For more information
on premultiplication,
see “The
Definition of Premultiplied” on page 375.
Example
In the following node tree, by mixing through the RotoShape node, you can color correct the beach and position the sky separately.
.
|
Beach
|
Grad1
|
 |
 |
|
RotoShape1
|
KeyMix1
|
 |
 |
|
Parameters
|
Type
|
Defaults
|
Function
|
| clipMode |
int
|
1 | Toggles between foreground (0) and background resolution (1) |
| channel |
string
|
"a' | The masking channel from the third image |
| mixPercent |
float
|
100 | The percentage of the second image mixed in. |
| invert |
int
|
0 | Inverts the masking channel of the third image. |
Synopsis
image KeyMix( image Foreground, image Background, int clipMode, const char * channel, float mixPercent invert );
Script
image = KeyMix( Foreground, Background, clipMode, "channel", mixPercent, invert );
Command Line
shake -keymix Background clipMode channel mixPercent invert