Answer
May 21, 2025 - 12:00 PM
A gray card in the market can not realize a perfectly diffuse reflection surface. Therefore, depending on the direction of incident light, there is a difference in reflection brightness. On the other hand, lumispheres used for incident light mode also have directivity (light distribution characteristics). Therefore, the measurement difference between incidence light and reflected light varies depending on the number of light sources and the incident direction. If you do not accept the difference, please create separate profiles for outdoor use and studio use.
