// Setup location for the point
ImGearPoint igPoint = new ImGearPoint(igPage.DIB.Width / 2, igPage.DIB.Height / 2);
// Setup color for the point.
ImGearRGBQuad igRGBQuad = new ImGearRGBQuad(0, 255, 0);
// Create the point annotation with a width of 10 and 60% opacity
ImGearARTPoint igARTPoint = new ImGearARTPoint(
igPoint, igRGBQuad, 10, (int)(0.60 * 255)
);
// Add the annotation to the ARTPage.
igARTPage.AddMark(igARTPoint, ImGearARTCoordinatesType.IMAGE_COORD);