Description
Returns a handle to an 8-bit gray scale image depicting the alpha channel data.
Syntax
| Visual Basic |
|---|
Public Function AlphaReturn() As Long |
Return Type
A handle to an 8-bit gray scale device independent bitmap depicting the alpha channel data.
Remarks
The original image (ProcessImageID) must be a 32-bit image where 8 bits are the alpha layer and 24 bits are RGB layer. Returning the handle implicitly reduces the image to 24-bit. The alpha layer may be modified and restored via the AlphaAdd method or else the caller is responsible for the handle and the memory associated with it. If the caller simply wishes to remove the alpha channel data then the AlphaRemove method should be used.