Color of object

Discuss how the color of objects is seen by the eye and by a camera in sunlight, moonlight and indoors (with light from light bulbs).

The colors of the object play a prominent role with their identification, but the color of an object is not a fixed property and it depends upon the nature of light. There are various reasons for the changes in color to occur and it is mainly due to dark adapted eye and color blindness. The blue color of the sky is mainly because of scattering of sunlight in the earth’s atmosphere, it is caused by Rayleigh scattering principle which tends to scatter more blue light than red light.

The eye work together with the brain to distinguish between distance of an object and estimate the size of the objects. Sensitivity of bright light occurs mainly due to the exposure of eye to sunlight or any bright objects. This kind of sensitivity is caused by dilate of pupils. An adjustable iris is necessary in both camera and light to range the intensity of light in environment. The difference in light intensities between light and moon-light is one million.

The human eye is more sensitive to light, it allows light to pass through and falls on the most sensitive part of the eye called retina, which is located at the rear part of the eye. Here there are two different photoreceptor cells known as cone and rod cells which are responsible for detecting color and low-light contrast respectively. They convert light into neural signals and responsible for vision. Rod cells cannot distinguish color, but are useful in detecting objects at low light vision. Cone cells are responsible for detecting color vision which intern require more light to function. Cones are further divided into long, medium and short wavelength light.

The objects illuminated with moon light lack color, it is because there is insufficient light for the eyes to perceive. The human eye is very complex than most advanced electronic camera. Here the rods can only sense the intensity of light but it cannot able to detect colors, thus by operating at very low intensity of light. While cones can able to differentiate between colors but need high intensity of light. In the case of objects seen by the eye in moonlight cones cannot operate and the brain cells receive signals from rod, therefore moonlight appears to be black and night vision. It is recommended to have a long exposure with color camera in moonlight; it would have all the colors as in daytime.

Human eyes are better when compared to cameras in compensating of low light. The lot of indoor objects that our eyes perceive to be well lighted to match with the upper limits of camera abilities. For filming in indoors, either a room with good artificial lightning should be choose, thus one can get best results when at maximum aperture is set. The aperture setting should be low for more light in the lens to enter in a camera. The lower aperture setting will result in least “depth of field”, and will have a great change in focus from object in the foreground.