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The color temperature scale describes only the color of light emitted by a light source, which may actually be at a different (and often much lower) temperature. [1] [2] Color temperature has applications in lighting, [3] photography, [4] videography, [5] publishing, [6] manufacturing, [7] astrophysics, [8] and other fields.
The Kelvin color temperature scale ranges from 1000K (amber) to 3000K (yellow) to 5500K (white) to 8000K (blue) to 12000K (purple). HID Lamp Color Temperature Range. HID lamps produce different colors of light primarily through the use of various metal additives in the lamp's arc tube and the physics of the gas discharge process. [11]
The first digital camera to use a Foveon X3 sensor was the Sigma SD9, a digital SLR launched in 2002. [5] It used a 20.7 × 13.8 mm, 2268 x 1512 × 3 (3.54 × 3 MP) iteration of the sensor and was built on a Sigma-designed body using the Sigma SA mount.
With HMI bulbs, color temperature varies significantly with lamp age. A new bulb generally will output at a color temperature close to 15,000 K during its first few hours. As the bulb ages, the color temperature reaches its nominal value of around 5600 K or 6000 K. With age, the arc length becomes larger as more of the electrodes burn away.
Color temperature can change as a result of varying the capacitor charge, making color correction necessary. Constant-color-temperature flash can be achieved by using appropriate circuitry. [18] Flash intensity is typically measured in stops or in fractions (1, 1 ⁄ 2, 1 ⁄ 4, 1 ⁄ 8 etc.). Some monolights display an "EV Number", so that a ...
There are two versions of the E-6 process. Commercial laboratories use a six-bath chemical process. The 'hobby' type chemistry kits, such as those produced by Tetenal, use three chemical baths that combine the color developer and fogging (reversal) bath solutions, and the pre-bleach, bleach and fixer bath solutions.
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The Wratten filters numbered with 80, 81, 82, and 85x are color conversion filters used to avoid unnatural colour casts when photographing scenes where the color temperature of the light source does not match the rated color temperature of the film, which is available in Tungsten and Daylight types. While the Wratten 80 and 82 series are ...
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