{"id":13286,"date":"2023-08-01T03:38:10","date_gmt":"2023-08-01T03:38:10","guid":{"rendered":"https:\/\/staging.rayzeek.com\/?p=13286"},"modified":"2023-12-26T08:37:29","modified_gmt":"2023-12-26T08:37:29","slug":"what-is-luminance-contrast","status":"publish","type":"post","link":"https:\/\/staging.rayzeek.com\/ru\/glossary\/what-is-luminance-contrast\/","title":{"rendered":"What is Luminance Contrast"},"content":{"rendered":"

What is Luminance Contrast<\/h2>\n\n\n

Luminance contrast is the difference in the amount of light reflected from one surface or component compared to another surface or component. It is a measure of the visual distinction between the object and its background. Luminance contrast is not the difference in color or color contrast, but rather the difference in the light reflective properties of each color.<\/p>\n\n\n\n

The calculation of luminance contrast can be expressed as a ratio or fraction, typically using the luminance values of the object and background. The formula for calculating luminance contrast is (L1 \u2013 L2)\/L1 or (L2 \u2013 L1)\/L1 = | \u0394 L\/L1 |, where L1 and L2 represent the luminances of the background and the object, respectively. This equation specifies the form of the luminance contrast calculation.<\/p>\n

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The ratio \u0394 L\/L1 in the equation is known as Weber’s fraction, which describes the smallest detectable difference in luminance. This helps determine the perceptual sensitivity to changes in brightness. In some cases, when only reflecting surfaces are involved, luminance contrast can be expressed in terms of reflectance. Reflectance refers to the ratio of light reflected by a surface to the incident light falling on it. The contrast formula using reflectance is (\u03c11 \u2013 \u03c12)\/\u03c11 or (\u03c12 \u2013 \u03c11)\/\u03c11, where \u03c11 and \u03c12 represent the reflectances of the background and the object, respectively. The method of computing contrast using reflectance holds true only for perfectly diffusing surfaces. For other surfaces, additional factors such as angles of incidence and view need to be taken into consideration.<\/p>\n

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