Intensity is another color option that you can adjust. It shows a degree of image displaying on the background. The parameter value can vary from 0 to 150% (from the minimum to the maximum intensity). You can change color intensity by entering a value from your keyboard into the appropriate spin box field, or by using the Up and Down arrows.
At the zero value of intensity an image disappears; a background is visible only. You can also change color intensity by using the slider. To activate it, click on the arrow located on the right of the spin buttons.