lighting ratio

Silhouetting occurs when there is a lighting ratio of 16:1 or greater.

The relative strength of key-to-fill, known as the lighting ratio, can be measured using a light meter.

The relative intensity of ambient light and fill light is known as the lighting ratio, an important factor in calculating contrast in the finished image.

The higher the lighting ratio, the higher the contrast of the image; the lower the ratio, the lower the contrast.

In situations such as motion picture lighting sometimes the lighting ratio is described as key plus fill to fill alone.

High-key lighting is a style of lighting for film, television, or photography that aims to reduce the lighting ratio present in the scene.

Silhouetting occurs when there is a lighting ratio of 16:1 or more; at lower ratios such as 8:1 the result is instead called low-key lighting.

The term "low key" is used in cinematography to refer to any scene with a high lighting ratio, especially if there is a predominance of shadowy areas.

A flat receptor typically is used for measurement of lighting ratios, for measurement of illuminance, and occasionally, for determining exposure for a flat subject.

Lighting ratio in photography refers to the comparison of key light (the main source of light from which shadows fall) to the fill light (the light that fills in the shadow areas).

When the sun is near or below the horizon, sunlight travels through more of the atmosphere, reducing the intensity of the direct light, so that more of the illumination comes from indirect light from the sky (Thomas 1973, 9-13), reducing the lighting ratio.