Image.DrawAlpha (gb.image)
Function DrawAlpha ( Image As Image [ , X As Integer, Y As Integer, SrcX As Integer, SrcY As Integer, SrcWidth As Integer, SrcHeight As Integer ] ) As Image
 
Copy the alpha channel of 
Image into the current image.
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X, Y are the destination of the copy. The default is the current image origin.
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SrcX, SrcY, SrcWidth, SrcHeight define the part of Image to copy. By default, the entire image is copied.