Parameter
Last updated on
Jun 23, 2025
Explore Ultra Key parameters and use them to adjust transparency, refine edges, suppress spill, and correct color for cleaner chroma key results.
The Ultra Key effect in Premiere Pro includes several parameter groups designed to fine-tune your chroma keying results with precision. The following tables explain each group and its settings.
Matte Generation
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Description |
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Transparency |
This controls the transparency of the source when keyed over a background. Values range from zero to 100. 100 is fully transparent, and zero is opaque. |
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Highlight |
Increases the opacity of light areas of the source image. You can use Highlight to extract details like specular highlights on transparent objects. Values range from zero to 100. The default value is 10. Zero does not affect the image. |
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Shadow |
Increases the opacity of dark areas of the source image. You can use Shadow to correct a dark element that became transparent because of color spill. Values range from zero to 100. The default value is 50. Zero does not affect the image. |
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Tolerance |
Filters out colors in the foreground image from the background. Increases tolerance to variation from the key color. You can use Tolerance to remove artifacts caused by color shift. You can also use Tolerance to control spills on skin tones and dark areas. Values range from zero to 100. The default value is 50. Zero does not affect the image. |
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Pedestal |
Filters out noise from the alpha channel, often caused by grainy or low-light footage. Values range from zero to 100. The default value is 10. zero does not affect the image. The higher the quality of your source image, the lower you can set Pedestal. |
Matte Cleanup
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Parameter |
Description |
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Choke |
Shrinks the size of the alpha channel matte. Performs a morphological Erode (fractional kernel size). Choke Level Values range from zero to 100. 100 represents a 9x9 kernel. Zero does not affect the image. The default value is zero. |
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Soften |
Blurs the edge of the alpha channel matte. Performs a box blur filter (fractional kernel size). Blur Level values range from zero to 100. Zero does not affect the image. The default value is zero. 1.0 represents a 9 x 9 kernel. |
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Contrast |
Adjusts the contrast of the alpha channel. Values range from zero to 100. Zero does not affect the image. The default value is zero. |
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Mid Point |
Chooses the balance point for the contrast value. Values range from zero to 100. Zero does not affect the image. The default value is 50. |
Spill Suppression
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Parameter |
Description |
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Desaturate |
Controls the saturation of the color channel background color. It desaturates colors that are close to being fully transparent. Values range from 0 through 50. 0 does not affect the image; the default value is 25. |
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Range |
Controls the amount of spill that is corrected. Values range from zero to 100. Zero does not affect the image. The default value is 50. |
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Spill |
Adjusts the amount of spill compensation. Values range from zero to 100. Zero does not affect the image. The default value is 50. |
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Luma |
It works with the alpha channel to restore the source's original luminance. Values range from zero to 100. Zero does not affect the image. The default value is 50. |
Color Correction
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Parameter |
Description |
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Saturation |
This controls the saturation of the foreground source. Values range from zero to 200. Setting it to zero removes all chroma. The default value is 100. |
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Hue |
Controls the hue. Values range from -180 ° to +180 °. The default value is 0°. |
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Luminance |
Controls the luminance of the foreground source. Values range from zero to 200. Zero is black. 100 is 4x. The default value is 100. |
