Browse the glossary using this index

Special | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | ALL

O

Overhead projector slides

A medium for projecting still images on a screen. OHP slides can be drawn by hand using felt tip pens, produced with a photocopier or generated using a computer printer. Unlike 35mm slides, OHP slides are placed on the projector manually, one-at-a-time, but have the advantage that they can be created in real-time or revealed gradually through the removal of a mask.