How are illumination luminance and reflectance related?

Illuminance (lux) x reflectance = luminance (apostilbs). Apostilbs is not an SI unit. To convert this to SI (candelas m-2) divide by pi (or multiply by 0.318). If the Munsell “Value” reference of a color is known the reflectance can be approximately calculated using Reflectance = V(V – 1) where V = value.

What is a reflectance curve?

A curve that illustrates the reflectance of light from a surface, such as paper, wavelength-by-wavelength throughout the visible spectrum, as a means of determining the color of that surface.

What is the difference between luminance and reflectance?

The light that reaches the eye (luminance) is a function of illumination (light source) and the percentage of that illumination that is reflected off the paper surface (reflectance).

What is illuminance and luminance?

Luminance describes the amount of light passing through the lightbulb, while illuminance describes the light hitting the desk. Because luminance and illuminance are quantifiable, they are not interchangeable with brightness.

What is illumination and reflectance?

Illumination is the amount of source light incident on the scene. It is represented as i(x, y). Reflectance is the amount of light reflected by the object in the scene. It is represented by r(x, y).

What is the formula of illumination?

Illuminance is the Luminous Flux per unit area of incident radiation away from the light source. (unit:Lux,lx) Illuminance can be considered the Flux within one square meter. lx = lm/ m2.

What does a reflectance spectral curve tell us?

Spectral Reflectance Curve The reflectance characteristics of the surface features are represented using these curves. These curves give an insight into the spectral characteristics of different objects, hence used in the selection of a particular wavelength band for remote sensing data acquisition.

What is meant by illumination and reflectance?

What is the difference between illuminance and illumination?

As nouns the difference between illumination and illuminance is that illumination is the act of illuminating, or supplying with light; the state of being illuminated while illuminance is (physics) the luminous flux incident on unit area of a surface; measured in lux or lumens.

What is the difference between illumination and reflection?

Illumination is the amount of source light incident on the scene. It is represented as i(x, y). Reflectance is the amount of light reflected by the object in the scene.