Passepartout (FR. passe partout) — a piece of cardboard or paper with cut out in the middle of a rectangular, oval or round hole frame in which to insert a photo, drawing or engraving. This allows more freedom to select the size of the frame under the image size. In addition, on the Mat often have to explain signature, autograph of the image.
Also Passepartout — prints, printed from engraved deep copper or xylographic boards with the prefix to it to another of the same boards that can be changed on the other.
Passepartout, also known as usual in the XVIII century engraving with a needle or etching framework, which, while remaining the same, surrounded by a different image, engraved separately from them, on special boards.