DrawMatte

DrawMatte -- paints on the image's opacity channel in order to set affected pixels to transparent

Description

void DrawMatte( DrawingWand drw_wnd, float x, float y, int paint_method )

Paints on the image's opacity channel in order to set affected pixels to
transparent, starting at the position specified by (x, y), and using the
specified paint method, paint_method.

paint_method must be one of the available paint methods, (i.e.: A
PaintMethod constant), one of the following:
   MW_PointMethod:        Select the target pixel.
   MW_ReplaceMethod:      Select any pixel that matches the target pixel.
   MW_FloodfillMethod:    Select the target pixel and matching neighbors.
   MW_FillToBorderMethod: Select the target pixel and neighbors not
                          matching border color.
   MW_ResetMethod:        Select all pixels.

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A description of each parameter follows:

drw_wnd	A DrawingWand resource
x	The x ordinate of the start position
y	The y ordinate of the start position
paint_method	A PaintMethod constant