What is kohler curve?

The Kohler curve is a graphical representation of the relationship between luminance and reflectance in colorimetry. It is named after Ernst Kohler, the scientist who first described it in 1949. The curve is created by plotting the logarithm of the reflectance of a given surface against the logarithm of its luminance.

The Kohler curve is commonly used in the field of color science to estimate the contrast sensitivity of the human visual system and to evaluate the performance of devices that capture or display images. It also provides insights into how objects appear under different lighting conditions and how human perception of color and brightness changes with illumination.

The shape of the Kohler curve varies depending on the surface properties of the objects being studied. Smooth surfaces, for example, tend to have a gentler curve than rough surfaces. Moreover, the curve changes with the angle of incidence of the light source and with the spectral properties of the light.

Overall, the Kohler curve is a useful tool for researchers and engineers who are interested in understanding the complex relationship between light, color, and human vision.