Luminance calculator

1. How is luminance value calculated?
2. How do you calculate luminance color?
3. How do you measure luminance contrast?
4. Is luminance the same as contrast?

How is luminance value calculated?

Alternatively, the luminance of a surface can be calculated from the formula L = E x § / ¹ where § is the luminance factor of the surface material and is read from a table of values. If the surface is diffuse then § can be replaced with "p", the diffuse reflection coefficient for the material.

How do you calculate luminance color?

x. Note 1: For the sRGB colorspace, the relative luminance of a color is defined as L = 0.2126 * R + 0.7152 * G + 0.0722 * B where R, G and B are defined as: if RsRGB <= 0.03928 then R = RsRGB/12.92 else R = ((RsRGB+0.055)/1.055) ^ 2.4.

How do you measure luminance contrast?

There are essentially two ways to measure the luminance contrast, in a laboratory or on-site, but both require the use of an expensive tristimulus colorimeter or spectrophotometer. The equipment will measure the 'Luminance Reflective Value' of each surface.

Is luminance the same as contrast?

Contrast is to black level as brightness is to luminance. Generally, contrast control is performed by adjusting the black level, or the amount of light emitted or transmitted by the low end of the display output.