DIGITAL UP Magazine NO.2 | Page 78

DIGITAL UP MAGAZINE
[Foto: 6] Geza Farkas - Serbia
THE REFLECTED LIGHT
When white light hits a surface,it is either reflected or absorbed, depending on the reflective nature of that surface. If a surface equally reflects all wavelengths of light, we see that as a white surface. If the surface absorbs all wavelengths within the white light spectrum, we see it as a black surface. When white light hits the surface which reflects wavelengths of red part of the spectrum of sunlight and absorbs other wavelengths, we see it as red. So it is with all other colors in the solar light spectrum. Different materials have different reflective properties and we see them as different colors. But for
simplicity, let’s say that the white light is reflected from the red surface. Following the reflection this light will be colored in red, and will have a much lower intensity, yet it will continue to travel…. If another surface is close enough to the previous surface and if the reflected light’s intensity does not drop too much, it will illuminate the other surface in red. In this way, the very primary illuminated surface becomes a secondary light source illuminating objects in close proximity (in our case this red is secondary light).
This phenomenon is called “radiance” and therefore the colors of objects in near proximity affect
each other. The radiating effect is usually very weak and requires a lot of light to be noticeable.
While in a scene with little