Color images

Color pictures

Color is the visual perceptual property corresponding in humans
to the categories called red, green, blue and others. Color derives
from the spectrum of light (distribution of light energy versus
wavelength) interacting in the eye with the spectral sensitivities
of the light receptors. Color categories and physical specifications
of color are also associated with objects, materials, light sources,
etc., based on their physical properties such as light absorption,
reflection, or emission spectra. By defining a color space, colors can be identified numerically by their coordinates.

Color of objects

The color of an object depends on both the physics of the object in its environment and the characteristics of the perceiving eye and brain. Physically, objects can be said to have the color of the light leaving their surfaces, which normally depends on the spectrum of the incident illumination and the reflectance properties of the surface, as well as potentially on the angles of illumination and viewing. Some objects not only reflect light, but also transmit light or emit light themselves (see below), which contribute to the color also. And a viewers perception of the objects color depends not only on the spectrum of the light leaving its surface, but also on a host of contextual cues, so that the color tends to be perceived as relatively constant: that is, relatively independent of the lighting spectrum, viewing angle, etc. This effect is known as color constancy.

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