Light Reflectance Value, or LRV, is the measurement that tells you how much light a colour reflects and conversely, how much it absorbs. LRV runs on a scale of 0% (Black) and goes up to 100% (White).
Luminance contrast is defined in Australian Standard 1428.1-2009 as the light reflected from one surface or component, compared to the light reflected from another surface or component. It is not the difference in the colour or the colour contrast, but the difference in the light-reflective properties of each colour.
Developed through complex calculations completed. This app is a very useful app intended to help Architects, Interior Designers, Disability Access Consultants, and even product manufacturers to get the closest estimate of the difference in contrast between two surfaces like disabled doors to walls, stair nosings to steps, tactiles to the surrounding surface, high visibility clothing, vehicle visibility, and anywhere that your phone can capture!