This way the foreground and background objects are separated. Thermal imaging detects the temperature difference between background and foreground objects. The clear image of ships in the foreground and background gives a sense of scale. It selects the maximum of each component from the foreground and background pixels. There is no separation into foreground and background variables. This can be reversed by swapping the foreground and background colors. Automatic thresholding will work best when a good background to foreground contrast ratio exists. This setup provides the opportunity to use different content for foreground and background. The artist uses bright colors to illuminate the figures in the foreground of the painting. The horizon frequently features vanishing points of lines appearing parallel in the foreground. Designed-in shadows can be stylized or connected to the foreground. Those in the right foreground are heavily weathered limestone boulders. One of the branches on the tree in the right of the foreground is severed. It was edited into the animated foreground of the scene. Also let formula 4 be the set of training images used as the foreground category.