Alpha Setter Effect
[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]
Note
[Deprecated. This API may be removed from future releases of Windows.]
The Alpha Setter effect sets the alpha bits on a video image.
Class ID (CLSID): {506D89AE-909A-44f7-9444-ABD575896E35}
CLSID Variable Name: CLSID_DxtAlphaSetter
Friendly Name: "DxtAlphaSetter"
Properties
| Property | Type | Default | Description |
|---|---|---|---|
| Alpha | BYTE | -1 | Sets the alpha for the entire image. |
| AlphaRamp | double | -1.0 | Sets the alpha as a percentage of the original alpha value. |
Remarks
A property with a negative value is ignored. Only one property can have a non-negative value. The Alpha property specifies a constant alpha value for every pixel in the image. This property overwrites the alpha values from the original image. The AlphaRamp property specifies each pixel's alpha value as a percentage of the pixel's original value, from 0.0 to 1.0.
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