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What is optical printing? (site 1)

Optical printing is a technique used to make copies of motion pictures to store them, improve them, or create motion graphics and visual effects. Optical printing is possible due to a device called an optical printer. It consists of a projector and a camera working together.

Explanation:

Optical printing allows the copy of motion pictures. Film-makers use this technique specially to create special effects. It consists of a device that has a camera and a projector opposite to each other. The camera photographs the film that the projector runs, creating copies. Motion effects such as slow-motion, loops, superpositions, modifying colors, amongst others, can be done with this technique. Film-makers also use it to restore a film or modify parts of it.

answer:   2 1/4 pounds

explanation: 4 1/2 - 2 3/4