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The human eye is composed of cones and rods, which are the photosensitive cells that allow us to see. There are three types of cones, each sensitive to one type of light, some to red light, others to blue light and others to green light. The colors produced by light (those of a computer monitor, in the cinema, television, etc.) identify red, green and blue as primary colors. This is because the human eye is composed of cones and rods which allow us to visualize. The sum of these three colors makes up white light.
In that sense, we live immersed in a world of color that is born of light and solar energy, but only a part of this energy is visible to the human eye. Light is an electromagnetic radiation composed of photons that travel through space as waves at 300,000 km per second, and vibrates with different wavelengths ranging from 380 to 780nm and color is only a part of light.
In fact, it is not only until Newton's discovery that numerous scientists and philosophers had tried to explain the phenomenon of color. On the other hand, Aristotle defined that all colors were obtained from the mixture of four basic colors: those of earth, fire, water and sky. In addition, light can come from a light source of one wavelength, or from lights with different wavelengths mixed, and give the same color. The color formed from the mixture of colors, can be determined from the chromatic circle.
In the same vein, color, first of all, is an attribute or a quality of light. Light and color are therefore two inseparable concepts. When we say that an object "is" a certain color, we refer to the way in which it is able to modify that quality when it reflects or transmits light. Each person perceives light and color differently. For some color blind people, for example, it is impossible to distinguish red from green.
Even among people with "normal" vision there will not always be unanimity in assessing whether or not two colors are the same, and even the same person may have different opinions under different conditions or over the years. Numerous optical illusions show that sometimes, affected by the environment and by experience, our vision confuses us and instead of showing us the reality, it can take us away from it. For the process of seeing an object to be verified, three factors are necessary: the light, the object and the observer.
Daylight" is usually the owner when comparing colors. Not only does it represent the type of light most commonly used in daily life, but its spectrum continues all colors with a highly uniform distribution, which allows the correct appreciation of colors and their differences when light strikes objects, its surface absorbing certain wavelengths and reflecting others.
In conclusion, it is important to note that there are two different color systems: the "additive" and the "subtractive" systems. The subtractive is the one that, when the three pigment colors are continued, the result is the dark, almost black color. This system is typical of printing colors, inks, among others. The additive color is the one that, once the three primary colors are added, produces a light or white color, typical of PC, screens. The light color is the one that our brain perceives when the light reaches our eyes. The human eye has photoreceptors called rods and cones. The cones are responsible for color vision.
Did you know about the color of light?
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