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K - Abbreviation for Kelvin.
K14 - The chemical process for developing Kodachrome slides.
KELVIN - The visible light spectrum is scientifically described in terms of color temperature, and is measured in degrees Kelvin (K).
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.
KEYSTONING - Distortion of a projected image when the projector is not directed perpendicular to the screen.
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.
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.