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"K" terms

"K" to "Kodak neutral test card"

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K - Abbreviation for Kelvin.

K14 - The chemical process for developing Kodachrome slides.

KB or Kb - See Kilobyte below.

KELVIN or KELVIN SCALE - The visible light spectrum is scientifically described in terms of color temperature, and is measured in degrees Kelvin (°K).

KERNEL - A group of 3 to 60 pixels, usually in the shape of a square, that is altered when adjusting image sharpening or in noise-reduction.

KEY LIGHT - Also called "main light." The principal source of light on a subject or a scene, usually in reference to a studio light. The key light is generally the brightest light on the subject, or the one that will have the greatest overall effect on the image.

Illustration of the effect of Keystoning.
Illustration of the effect of Keystoning.

KEYSTONING - Distortion of a projected image when the projector is not directed perpendicular to the screen.

KEY TONE - (1) The "K" in CMYK, representing black in an image. (2) An image's dominant or most important tone, often the middle tone between black and white.

Image showing the effect of a Kicker used for backlighting.
Image showing the effect of a Kicker used for backlighting.

KICKER - (1) A side or back light often near lens height used to rim faces and model profile shots. (2) A light used to provide an additional highlight or accent on a subject.

KILOBYTE - 1,024 bytes. Commonly employed to loosely indicate 1,000 bytes.

KODAK™ - (1) More commonly-used name of the Eastman Kodak Company™, a U.S. technology company that manufactures and sells cameras and other photography products, with a powerful history in photography. (2) A name some give to their cameras, as in "I put film in my Kodak."

KODAK NEUTRAL TEST CARD - Also known as the “Gray card,” a Kodak neutral test card is an 8" X 10" (20 cm by 25.5 cm) card, about 1/8" thick, that is uniformly gray on one side. The gray side reflects precisely 18% of the white light that strikes it (corresponding to the calibration of a reflected-light meter). It is uniformly white on the other side, which reflects 90% of the light.

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