WatermarkPosition.RightBottom => new Point(inputImageSize.Width - watermarkSize.Width,
WatermarkPosition.RightTop => new Point(inputImageSize.Width - watermarkSize.Width, 0),
WatermarkPosition.RightBottom => new Point(inputImageSize.Width - watermarkSize.Width,
WatermarkPosition.RightTop => new Point(inputImageSize.Width - watermarkSize.Width, 0),