Pan:   To follow the motion of a moving object to look sharp and the background blurred.

Panchromatic Film that is sensitive to all (or almost all) wavelengths of the visible spectrum.  Abbreviated pan.

Parallax The difference in point of view that occurs when a lens (or other device) from which the eye views scene is separate from the lens that exposes the film.

PC connecter:  See sync cord.

PC terminal:  The socket on a camera or flash unit in which a PC connector (sync cord) is inserted.

Perspective:  The apparent size and depth of objects within an image.

Photoflood:  An incandescent light that produces very bright light but has a relatively short life.

Photogram:  An image produced by placing material directly onto a sheet of sensitized film or printing paper and then exposing the sheet to light.

Photomontage:  A composite image that is made by cutting out and assembling parts of several photographs.

Pinhole 1.)  A small clear spot on a negative, usually caused by dust on the film during exposure or development or a small air bubble that keeps developer from the film during development.  2.) The tiny opening in a pinhole camera that produces the image.

Plane of critical focus:  The part of a scene that is most sharply focused.

Plate:  In early photographic processes, the sheet of glass or metal on which emulsion was coated.

Platinum print A film in which the final image is formed in platinum rather than silver.

Polarizing filter:  A filter that reduces reflections from non-metallic surfaces such as glass or water by blocking light waves that are vibrating at selected angles of the filter.

Positive Any image with tones corresponding to those of the subject.  Opposite:  negative.

Posterization:  An image with a flat, poster-like quality.  High contrast lith film is used to separate gray tones of a negative into a few distinct shades of gray.

Presoak:  To soak film briefly in water prior to immersing it in developer.

Press camera A camera that uses sheet film, like a view camera, but which is equipped with a viewfinder and a hand grip so it can be used without being mounted on a tripod.  Once widely used by press photographers, it has been replaced by 35mm cameras.

Primary colors:  Basic colors from which all other colors can be mixed. See also: subtractive, additive

Print:  A photographic image, usually a positive one on paper.

Printing frame:  A holder designed to keep sensitized material, usually paper, in full contact with a negative during contact printing.

Programmed automatic A mode of automatic exposure in which the camera sets both the shutter speed and the aperture that will produce the correct exposure.

Projection printing The process of projecting an image of a negative onto sensitized material, usually paper.  The image may be projected to any size, usually larger than the negative. 

Projector:  An optical instrument for forming an enlarged image of a transparency or a motion picture on a screen.

Proof:  A test print made for the purpose of evaluating density, contrast, color balance, subject composition and the like.

Push:  To expose film at a higher film speed rating than normal, then to compensate in part for the underexposure by giving greater development than normal.  This permits shooting at a dimmer light level, a faster shutter speed, or a smaller aperture than would otherwise be possible.