Scale Screen Concepts Back to index... The scale screen is used to scale, move and rotate the foreground and background images. To show the effects of scaling the we do a fast combine of the foreground and background. Once you stop scaling a full green screen combine will be shown. Controls: Foreground/Background Buttons - this button selects the foreground or background image for scaling Move and Scale the image You can move the image on the home screen by dragging it. To scale the image, use a pinching motion with 2 fingers. To rotate the foreground or the background simply click the rotate icon.