Object illuminated by white light
diffusion, an object receives light and then sends back a part of it in
possessed by objects depends on the light they diffuse: its color is
the same as the color diffused.
For instance, an object diffusing only red lights, sends back red
lights and absorbs all other colored lights: its color seems to be red.
Conversely, we can deduce from the color of an object the colors it
absorbs: for instance, a green object absorbs all colored lights except
the green ones that are diffused.
Object illuminated by a colored light
The color of an object depends on the color of light by which it is
If an object receives only lights that are absorbed, it seems to be
- A red object ( in white light ) illuminated by a green light seems to
- A red object illuminated by a blue light seems to be black.
- A red object illuminated by a cyan light ( mix of green and blue
lights ) seems to be black.
If an object receive a light that it doesn't absorb, it keeps the same
color as with white light.
- A red object ( in white light ) illuminated by a red light seems to
- A red
object ( in white light ) illuminated by a magenta light ( mix of red
and blue lights ) seems to be red.
A red object ( in white light ) illuminated by a yellow light ( mix of
red and green lights ) seems to be red.