'Declaration
 
Public Function GetAlphaChannel( _
   ByVal ImageID As Integer, _
   ByRef Alpha() As Byte, _
   ByVal SrcLeft As Integer, _
   ByVal SrcTop As Integer, _
   ByVal Width As Integer, _
   ByVal Height As Integer _
) As GdPictureStatus

public GdPictureStatus GetAlphaChannel( 
   int ImageID,
   ref byte[] Alpha,
   int SrcLeft,
   int SrcTop,
   int Width,
   int Height
)

public function GetAlphaChannel( 
    ImageID: Integer;
   var  Alpha: Bytearray of;
    SrcLeft: Integer;
    SrcTop: Integer;
    Width: Integer;
    Height: Integer
): GdPictureStatus; 

public function GetAlphaChannel( 
   ImageID : int,
   Alpha : byte[],
   SrcLeft : int,
   SrcTop : int,
   Width : int,
   Height : int
) : GdPictureStatus;

public: GdPictureStatus GetAlphaChannel( 
   int ImageID,
   ref byte[]* Alpha,
   int SrcLeft,
   int SrcTop,
   int Width,
   int Height
) 

public:
GdPictureStatus GetAlphaChannel( 
   int ImageID,
   array<byte>^% Alpha,
   int SrcLeft,
   int SrcTop,
   int Width,
   int Height
) 

Parameters

ImageID

GdPicture image identifier.

Alpha

Output parameter. The Alpha channel data.

SrcLeft

The left source pixel of the area.

SrcTop

The top source pixel of the area.

Width

The width of the area in pixel.

Height

The height of the area in pixel.

Return Value

Reference

GdPictureImaging Class
GdPictureImaging Members
SetAlphaChannel Method