H FORMAT

Definition: A 4x7 print. Similar to the motion picture and HDTV screen format.

H&D CURVE

Definition: Another name for the D/log E curve, after its originators, Ferdinand Hurter and Vero C. Driffield.

HALATION

Definition: Is a diffused ring of light typically formed around small brilliant highlight areas in the subject. It is caused by light passing straight through the emulsion and being reflected back by the film base on the light sensitive layer. This records slightly out of register with the original image.

HALF-FRAME

Definition: negative format of 18 x 24mm. Images are recorded on a vertical axis on standard 35mm film, thus giving 72 half-frame images on film designed for 36 exposures.

HALF-FRAME CAMERA

Definition: camera designed to use 35mm film in a half-frame format.

HALF-PLATE

Definition: picture format measuring 4 ¾ x 6 ½ inches. Some early cameras produced negatives of this size.

HALFTONE

Definition: mechanical process for printing continuous tone images in ink.

Definition: An image that can be reproduced on the same printing press with ordinary type. The tones in the photograph are screened to a pattern of dots (close together in dark areas, farther apart in light areas) that give the illusion of continuous tone.

Definition: The process of reproducing a continuous tone image as a series of various sized dots within a fixed grid that can be reproduced with ink on a printing press. The finer the dot grid the higher the quality of the reproduction.

Definition: The reproduction of a continuous-tone image, made by using a screen that breaks the image into various size dots.

HALFTONE IMAGE

Definition: An image reproduced through a special screen made up of dots of various sizes to simulate shade of gray in a photograph. Typically used for newspaper or magazine reproduction of images.

HALFTONE SCREEN

Definition: A pattern of dots of different sizes used to simulate a continuous tone photograph, either in colour or black and white.

HALO

Definition: A light line around object edges in a image, produced by the USM (sharpening) technique.

HALOGENS

Definition: collective term for the elements chlorine, bromine and iodine, which are combined with silver to produce the light sensitive crystals used as the basis for photographic emulsions.

HAND COLORING

Definition: process of applying color tints, in the form of paint, to a photographic image to create or enhance the color effect.

HANGER

Definition: frame for holding sheet film for processing.

Definition: A frame for holding sheet film during processing in a tank.

HARD

Definition: defines a scene, negative or print with high contrast.

Definition: 1. Describes a scene, negative, or print of high contrast. Opposite: soft or low contrast. 2. Describes a printing paper emulsion of high contrast such as grades 5 and 6.

HARD COPY

Definition: Refers to a print or proof, as opposes to viewing on a monitor.

HARD DRIVE

Definition: A built-in or off-line fixed storage medium which holds large amounts of data that can be accessed rapidly depending on the power of the computer.

HARD GRADATION

Definition: term denoting the quality of harsh contrast in a photograph.

HARD PROOF

Definition: A printed proof of an image or document, intended to accurately convey colour. Contrast with soft proof.

HARDENERS

Definition: Are chemicals often used with a fixing bath to strengthen the physical characteristics of an emulsion. The most common hardeners are potassium or chrome alum.

HARDWARE

Definition: The processor, monitor, printer, and other physical devices that make up a computer system.