A light box consists of a translucent glass or plastic screen held in a rigid frame and illuminated from below by a light. The slight opacity of the screen helps to defuse the light evenly over the area – an important consideration for effective color evaluation and control of color in reprographic and printing work. It is in these areas that a light box is used most frequently. Transmitted light is very useful for work on film surfaces and any piece requiring registrations with other related drawings. Designers, multi-media artists and scrapbookers also employ the light box as an aid to accurate tracing and retouching where a high degree of show through from the original is required in order to see small details.