Basic Keyer
Brief Description
A Basic Luminance Keyer, which computes the key color from the RGB values of the image. From the key color, a background transparancy is computed. For example, is is useful to mask out a sky which is almost always the brightest thing in the image.
Controls
| Parameter / Script Name | Type | Default | Function |
|---|---|---|---|
Enabled / enabled | Boolean | On | |
Mode / mode | Choice | Luminance | - Luminance: Uses the source pixel luminance to pull a key - Color: Uses the source pixel color to pull a key - Screen: Uses a color difference between the max component minus the other components for keying - None: Only despill is applied to RGB. You can control despill areas using the inside matte, or use with Alpha Mode set to Add to Inside Matte. If Output is set to Unpremultiplied, this despills the image even if no mask is present |
Luminance Mode / luma_formula | Choice | Rec. 709 | Luminance formula used when mode is not None - Rec. 709 - Rec. 2020 - ACES ap-0 - ACES ap-1 - CCIR 601 - Average: Average of intensities - Max: Maximum of intensities |
Alpha Mode / alpha_mode | Choice | Ignore Source Alpha | - Ignore Source Alpha - Add To Inside Matte: The source alpha channel is added to the inside matte. This is useful for multi-pass keying - Normal: The foreground key is multiplied by thee source alpha |
Output / output_mode | Choice | Premultiplied | - Source Color + Key Alpha: Outputs the source color and alpha of the foreground key. Useful for multi-pass keying - Premultiplied: Color is the source color after key color suppression, multiplied by alpha. Alpha is the foreground key - Key: Foreground key is output in RGBA channels |
Key Color / key_color | Color | 0, 1, 0, 1 | |
Lower Softness / lower_softness | Float | -0.5 | Background key value goes from 0 to 1 when foreground key is over this range |
Lower Tolerance / lower_tolerance | Float | 0 | Background key value is 1 when foreground key is over this range |
Center / center | Float | 1 | Foreground key value forresponding to the key color, where the background key should be 1 |
Upper Softness / upper_softness | Float | 0.5 | Background key value goes from 1 to 0 when foreground key is over this range |
Upper Tolerance / upper_tolerance | Float | 0 | Background key value is 1 when foreground key is over this range |
Despill / despill | Float | 1 | Reduces color spill on the foreground. When between 0 and 1, only mixed regions are despilled. Above 1, foreground regions are despilled too |
Despill Angle / despill_angle | Float | 120 | Opening of the cone centered around the keyColor where colors are despilled. A wider angle means that more colors are affected |
Inside Matte / inside_matte | Image | - | |
Outside Matte / outside_matte | Image | - |