Specifies how the output buffer should be changed at the end of the delay (before rendering the next frame).
public enum PngDisposalMethod : int
No disposal is done on this frame before rendering the next; the contents of the output buffer are left as is.
The frame's region of the output buffer is to be cleared to fully transparent black before rendering the next frame.
The frame's region of the output buffer is to be reverted to the previous contents before rendering the next frame.