|Color:| set the gradient |color| parameters. Gradients are processed as three independent channels with 256 levels whenever the image processor is a color format.
|Gray:| set the gradient |gray| parameters. Gradients are processed as 256 intensity levels whenever the image processor is to a gray-level format.
|B&W:| set the gradient |B&W| parameters. Gradients are processed as 16X16 gray-level patterns whenever the image processor is set to the |Black & White| format.
