ImageData = GIFHeader
                  ImageData = ImageData & MakeWord(Width_)
                  ImageData = ImageData & MakeWord(Height_)
                  ImageData = ImageData & MakeByte(GlobalDescriptor)
                  ImageData = ImageData & MakeByte(BGroundColorindex)
                  ImageData = ImageData & MakeByte(PixelAspectRatio)
                  ImageData = ImageData & GetGColorTable
 
                  If GIF89a Then
                           If UseTransparency Then
                                    ImageData = ImageData & MakeByte(GraphicControl)
                                    ImageData = ImageData & MakeByte(&HF9)
                                    ImageData = ImageData & MakeByte(&H04)
                                    ImageData = ImageData & MakeByte(&H01)
                                    ImageData = ImageData & MakeByte(&H00)
                                    ImageData = ImageData & MakeByte(TransparentColorindex)
                                    ImageData = ImageData & MakeByte(&H00)

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