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2. Lighting ratio - Wikipedia

   en.wikipedia.org/wiki/Lighting_ratio

   The lighting ratio is the ratio of the light levels on the brightest-lit to the least-lit parts of the subject; the brightest-lit areas are lit by both key (K) and fill (F). The American Society of Cinematographers (ASC) defines lighting ratio as (key+fill):fill, or (key+Σ fill ):Σ fill , where Σ fill is the sum of all fill lights.

3. Photographic lighting - Wikipedia

   en.wikipedia.org/wiki/Photographic_lighting

   Photographic lighting refers to how a light source, artificial or natural, illuminates the scene or subject that is photographed; put simply, it is lighting in regards to photography. Photographers can manipulate the positioning and the quality of a light source to create visual effects , potentially changing aspects of the photograph such as ...

4. Three-point lighting - Wikipedia

   en.wikipedia.org/wiki/Three-point_lighting

   The addition of a fourth light, the background light, makes for a four-point lighting setup. The background light is placed behind the subject(s), on a high grid, or low to the ground. Unlike the other three lights, which illuminate foreground elements like actors and props, it illuminates background elements, such as walls or outdoor scenery.

5. Illuminance - Wikipedia

   en.wikipedia.org/wiki/Illuminance

   Illuminance diagram with units and terminology. In photometry, illuminance is the total luminous flux incident on a surface, per unit area. [1] It is a measure of how much the incident light illuminates the surface, wavelength-weighted by the luminosity function to correlate with human brightness perception. [2]

6. Exposure (photography) - Wikipedia

   en.wikipedia.org/wiki/Exposure_(photography)

   In photography, exposure is the amount of light per unit area reaching a frame of photographic film or the surface of an electronic image sensor.It is determined by shutter speed, lens f-number, and scene luminance.

7. Light value - Wikipedia

   en.wikipedia.org/wiki/Light_value

   The later Pentax Spotmeter V and Digital Spotmeter indicated directly in EV for ISO 100, but they made no mention of "light level", "light value", or LV. A synonym for incident light value, from the Additive system of Photographic EXposure . Zakia and Stroebel (1993) and Stroebel, Compton, Current, and Zakia (2000) used the term in this sense.

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   mail.aol.com

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9. Sunny 16 rule - Wikipedia

   en.wikipedia.org/wiki/Sunny_16_rule

   Sunlit subject shot on a digital camera set to ISO 100, exposed at f/8 at 1/400 second which is the same exposure value as f/16 for 1/100 second, the recommended "sunny 16" exposure. In photography, the sunny 16 rule (also known as the sunny f /16 rule) is a method of estimating correct daylight exposures without a light meter. Apart from the ...