Share via

IDxtAlphaSetter::put_AlphaRamp

  • Article
 
Microsoft DirectShow 9.0

IDxtAlphaSetter::put_AlphaRamp

The put_AlphaRamp method specifies the alpha ramp property. The alpha ramp is the percentage by which the alpha values in the original image are adjusted. For example, if the alpha ramp is 0.5, the alpha values in the image are reduced 50%.

Syntax

  HRESULT put_AlphaRamp(
    double Alpha
);

Parameters

Alpha

[in] Specifies the alpha ramp as a percentage. For example, 1.0 is 100%. To disable this property, set a negative value.

Return Values

Returns an HRESULT value.

Remarks

If you set this property to a non-negative value, you must also disable the alpha property, by calling put_Alpha with a negative value. Otherwise the effect will not render correctly.

Requirements

Header: Include Qedit.h. This header file is not compatible with Microsoft® Direct3D® headers later than version 7.

Library: Use strmiids.lib.

See Also