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A filter that lets you assign a new alpha value to the original image by extracting it from a luminance range.

Effect Parameters

Presets
Presets contain a snapshot of the plug-in parameters. The Presets control lets you choose among one of the presets built into the plug-in, save current parameter values to a preset file, or load an existing preset file from disk.
A preset file saved to disk via the "Save As" button can be loaded from another instance of the same plug-in by clicking the "Open" button. Presets generated in one host can also be loaded from the same plug-in when used in a different host.

Source Value, Aperture and Softness
The effect is applied to a given range of pixels, based on their luminance value. Luminance values range from 0 (black) to 1 (white). The "Source Value", "Source Aperture" and "Source Softness" parameters give you precise controls to define this range:

The "Source Luminance" parameter specifies the center of the range of pixels. For example, a value of 0.5 means that the effect is applied to pixels that are 50% bright.

The "Source Aperture" parameter controls the width of this range. For example, a value of 0.5 with aperture of 0.2 means that all pixels between 40% and 60% brightness will be used as the source for the effect. An aperture value of 1.0 means that the effect is applied to the entire image.

It may be desirable to have a smooth transition between the pixels that are within the range and those that fall outside it. The "Source Softness" parameter defines the width of this smooth border. By adding soft borders to the range (one at the start, one at the end) you eliminate the sharp transition. A softness of 1.0 means that the range is smoothed over the entire image.

Background Color
The background color used to fill the area whose alpha will no longer be 1 after the effect is applied. This color is ignored when the "Background Opacity" parameter is zero (its default value).

Background Opacity
The opacity of the background color. This effect may cause pixels in the original image to have an alpha that is less than 1 after the effect is applied. By setting this parameter to a value other than zero, you can assign a background color to these pixels.

Color Space
This parameter allows you to choose a working color space for the effect. When the “Linear” option is selected, the plug-in will convert all color values to a non-gamma-corrected format. When the “Uncorrected” option is selected, the color values supplied by the host will be used directly, without conversion. It may help to choose “Uncorrected” when dealing with smooth gradients or vector-art backgrounds, or if you have already applied gamma correction to your source media in a previous step of your workflow.