Color Screen Concepts Back to index... Often the foreground and background images do not have matching color levels. To fix this the Color Screen lets you change the red, green, blue levels of the foreground or background image. Controls: Foreground/Background Buttons - this button selects the foreground or background image for change Red Slider- this control will change the red level of the image Green Slider- this control will change the green level of the image Blue Slider- this control will change the blue level of the image