| G |
| GELATIN: |
A nearly transparent substance, obtained by boiling animal tissue in water, used as (1) the medium for suspending light-sensitive silver halide crystals on photographic film, and (2) in the manufacture of gelatin filters. |
| GELATIN FILTER : |
| Also known as “gelatin slide” and “gel,” a thin sheet of translucent colored gelatin for placing over lights to obtain lighting effects, and in the manufacture of photographic filters for lenses. Gels are available in a wide color variety. |
| GELS: |
| Generic term used in reference to any colored translucent material (color media) that is used to color a light, whether the material is made from gelatin, glass or plastic. |
| GHOST IMAGE: |
| In time exposure photography, an object that is only partially recorded on the film and therefore has a translucent, ghost-like appearance. Ghosting also occurs when using electronic flash at a slow shutter speed, and a second image is captured on the film by ambient light. Some people also refer to “flare” as a ghost image. |
| GIF (Graphic Interchange Format): : |
| 256-color imaging system designed for reproducing images over the Internet. |
| GIGABYTE (GB): : |
| 1000 megabytes (1000 MB) or 1,000,000 kilobytes or one billion bytes. |
| glossary: |
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| GLOSSY PAPER: |
| Shiny-surfaced paper used in making photographic prints. |
| GN (Guide Number) : |
| Number calculated by multiplying proper flash-exposure aperture by the subject distance (in feet or meters); used to express the light output of flash units. Note: ISO must be specified but is usually 100. |
| GOBO: |
| A light-blocking device that falls under the general category of "Grip equipment." Generally used in a studio to prevent illumination from a studio light striking a portion of a scene. A "gobo" can be a simple piece of opaque cardboard or a sophisticated material in a specific shape, often a rectangle or square. "Barn doors" are gobos. |
| GOLDEN MEAN: |
| Also referred to as the “Golden section” and the “Gold mean,” the Golden mean is an ancient fine arts formula that mathematically defines a rectangle of specific proportions. This rectangle, called the “Golden rectangle,” is believed to frame objects in pleasing proportions. |
