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50% CIELAB lightness (Y = 18.4%)
In photography, painting, and other visual arts, middle gray or middle grey is a tone that is perceptually about halfway between black and white on a lightness scale;[1] in photography and printing, it is typically defined as 18% reflectance in visible light.[2][3]
Light meters, cameras, and pictures are often calibrated using an 18% gray card[4][5][6] or a color reference card such as a ColorChecker.[7][8][9] On the assumption that 18% is similar to the average reflectance of a scene, a gray card can be used to estimate the required exposure of the film.[5]
^Stephen Quiller (1999). Painter's Guide to Color: Includes the New Quiller Color Wheel. Watson-Guptill. ISBN 0-8230-3913-7.
^Blain Brown (2002). Cinematography: Theory and Practice : Imagemaking for Cinematographers, Directors, and Videographers. Focal Press. ISBN 0-240-80500-3.
^Woods, Mark. How to Effectively Use the Gray Card Archived 2014-11-29 at the Wayback Machine. cameraguild.com
^Steven Barclay (1999). The Motion Picture Image: From Film to Digital. Focal Press. ISBN 0-240-80390-6.
^ abFilm and Its Techniques by Raymond Spottiswoode
^Gevaert Manual of Photography, ed. A.H.S. Craeybeckx
^C. S. McCamy, H. Marcus, and J. G. Davidson (1976). "A Color-Rendition Chart". Journal of Applied Photographic Engineering2(3). 95–99.
^Shoptalk: a new tool for checking color photography by Norman Goldberg
^How to Photograph Landscapes & Scenic Views by David Brooks
In photography, painting, and other visual arts, middlegray or middle grey is a tone that is perceptually about halfway between black and white on a...
A gray card is a middlegray reference, typically used together with a reflective light meter, as a way to produce consistent image exposure and/or color...
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