What is color?
Let us first explain that the color is come from light by Newton's experiment of simulating the phenomenon of rainbows; then, after the light enters the human eye, photoreceptor cells will receive and act on the light for colors from the object; at last, let’s explore what happened when the light hits on the object, through the dance of light - Reflection, Absorption and Transmission to have further understand the color. In addition, since the judgment of the color is not the same by each person, through UPRtek spectrometer to determine the color consistency, color rendering and saturation...etc. Let’s agree to disagree.
The Experiment of Simulating the Phenomenon of RainbowIn the experiment of simulating the phenomenon of rainbow, which was performed by Isaac Newton, he pointed a light beam at a prism. The light, as it went through it, bent or refracted and separated the light into different colors. It proved that light is made up of many colors. In a rainbow, the clear rain droplets act as small prisms, also dispersing light into different colors.
Nothing “has” ColorBesides, Sir Isaac Newton also established that the colors that we see on objects (e.g. apples) are not attached to those objects - the colors come from an original light source. In other words, nothing inherently has color - just turn off the light and you will “see”. Nothing has color!
Human’s Photoreceptor CellsLight waves can enter our eyes. In the back of our eye is the retina - the retina has photoreceptor cells (cells that can receive and act on light waves) - These photoreceptors are called Rods and Cones.
Scotopic Vision and Photopic Vision
Human Visible Light RangeLight is considered electromagnetic radiation, which is a general term that includes all visible and invisible sources of electromagnetic waves, ranging from UV light, x-rays, visible waves, infrared to radio waves. As you see below, the Visible Light is only a very small portion of that. This much we know - all forms of electromagnetic radiation carries energy. According to Wikipedia, the range of wavelengths that can be perceived by the human eye generally falls in the range of 390nm to 700 nm. The range of light measured by UPRtek spectrometers falls from 380nm to 780 nm.
Color Transfer ProcessThese Rods and Cones process light and send impulses through the Optic Nerve to our brain, which form an image IN OUR MINDS. Therefore, we may say our colors are inherently a human experience. And colors are come from light.
Dance of Light – Activities when Light Hit an ObjectThe red that you see in the apples come from the original light source, the sun, which reflects off the apple and reaches our eyes. What happened to blues, greens and yellows? The answer lies in three things that happen when a light source hits on an object:
ReflectionReflect is when the light (e.g. red light) reflects off a surface.
AbsorptionThis is what happened to the other colors in the apple example. The blues, yellows, greens were absorbed by the apple! The absorbed energy turned to heat in the apple.
TransmissionThis is what a prism does; it lets the light go through (with a little refraction/bending).
Measurement – Agree to DisagreeWhen two people cannot agree on the same color...what to do? I believe you have had similar experience. This situation is normal. A reference to Wikipedia shows that there are more than 130 million photoreceptors on the retina... and each photoreceptor cell handles the transmission of different colors... So, the judgments of color are also different. Therefore, many international organizations establish color standards based on the needs of different industries, such as CRI, GAI, CQS, TM30-15, TLCI, and so on. UPRtek spectrometers provide you with standard measurements to help you determine color consistency, color rendering and saturation, etc. Let’s agree to disagree.
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UPRtek What is color? Introduction
United Power Research Technology Corp. is Taiwan supplier and manufacturer in Optoelectronics Industry. UPRtek has been offering our customers high quality Spectrometer, Color Meter, Spectral PAR Meter, Spectral Color Meter, Spectrum, LED Meter, Spectradiometer, LED Measurement, LED light testing since 2010. With both advanced technology and 8 years experience, UPRtek always make sure to meet each customer's demand.