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contrast

(1) The general term for describing the tone separation in a print in relation to a given difference in the light-and-shade of the negative or subject from which it was made. Thus, contrast is the general term for the property called gamma (Y), which is measured by making an H & D Curve for the process under study. (2) The range of tones in a photographic negative or positive expressed as the ratio of the extreme opacities or transparencies or as the difference between the extreme densities. This range is more properly described as scale or latitude. (3) The ability of a photographic material, developer, or process as a whole to differentiate among small graduations in the tones of the subject.

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contrast

(1) the range of difference between highlights and shadow areas in an image. Many factors affect an image’s contrast, including the degree of development and the contrast grade of the paper on which an image is printed. (2) The range of brightness in a scene or in the light striking a subject. (Sometimes contrast is also referred to as Density. )
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contrast

A colored filter that attaches to a camera s lens when photographing in black and white that lightens or darkens an object or an area of the scene.
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contrast

A scale using numbers (generally 1 to 5) or terms (soft, medium, hard, extra-hard and ultra-hard) that refer to the contrast level of photographic papers. (A high contrast negative printed onto low-numbered or soft contrast grade paper will more closely reproduce the normal contrast of the original scene, and vice-versa.)
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contrast

In black and white printing, an indication of the contrast rendition the paper will yield. #0 and #1 are low contrast #4 and #5 are high contrast. The normal contrast grade is #2.
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contrast

The difference between the darkest and lightest areas of a subject, stated in a mathematical ratio.
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