What is color?

What Is Color? Its Origin and Perception

Color feels obvious — red, blue, green. In reality, however, it is not merely a “property of an object”. It is the result of an interaction between light, the material surface, the eye and the brain. That is why the same object can look different in the morning, in the evening, and under different LED light sources.

Color does not begin in the object. It begins in light.

From a physics perspective, color is linked to visible radiation. When white light hits a surface, part of the spectrum is absorbed, part is reflected, and in some cases part is transmitted. The reflected or transmitted spectrum is what reaches our eyes. An object therefore does not “contain” color in an absolute sense — it reacts selectively to light, and we interpret that result as a specific color.

In practical terms, this means one thing: without light, there is no color. If we change the light source, we also change the conditions under which a material reveals its color. This matters in interior lighting, retail, product display, photography, design, and anywhere accurate color appearance affects decision-making.

How do humans see color?

Light enters the eye, passes through the cornea and lens, and reaches the retina. Two major types of photoreceptors operate there: rods and cones. Rods are crucial in low-light vision but do not provide precise color discrimination. Cones are primarily responsible for color vision, and they respond to different wavelength ranges. The signals generated in the eye are then processed by the nervous system and brain, where the final color experience is formed.

This distinction matters: wavelength is a physical phenomenon, but color is a perceptual experience. Light can be measured instrumentally, while color is the way a human observer interprets visual input. That is also why two people may perceive the same object slightly differently, especially under difficult lighting conditions.

Why does the same color look different in different conditions?

Because color is relational, not fixed. The object itself matters, but so do surrounding colors, contrast, light level, source spectrum and even visual fatigue. A light sample against a dark background may appear even lighter. Warm light may enhance reds and golden tones while weakening the perception of cooler hues. A source with poor color rendering can make materials look flat, dull or simply wrong.

Material also matters. A matte textile behaves differently from a glossy board, and differently again from aluminium, glass or a translucent surface. Texture, gloss and light diffusion all influence the appearance of the same nominal color. That is why lighting design should never stop at correlated color temperature alone.

RGB and CMYK: two different color worlds

In daily work, these two systems are often confused. Screens rely on RGB, an additive color model in which red, green and blue light build the image. Print relies on CMYK, a subtractive model in which inks and pigments remove part of the reflected light. That is why the same project may look one way on a monitor and another way when printed.

For the end user, the key takeaway is simple: the color you see on screen will not always match how the product looks in reality under a specific light source.

How can color be described more precisely?

In simplified terms, color is often described through three core dimensions:

• hue — whether we perceive red, green, blue and so on,
• lightness / value — how light or dark the color appears,
• saturation / chroma — how pure, intense or muted the color appears.

This is far more useful than saying something is “nice white”, “warm grey” or “slightly blue”. In professional work with materials and lighting, precision of language supports precision of results.

What does this mean for LED lighting?

In lighting practice, color is not abstract theory. It is one of the key quality criteria. Good LED lighting should not only provide enough light output, but also allow materials and surfaces to appear clear, readable and natural. This matters in homes, kitchens, bathrooms, wardrobes, retail spaces, offices, displays and every environment where people judge materials visually.

That is why selecting lighting should involve more than wattage or color temperature alone. Color rendering quality and the compatibility of the light source with the intended function of the space are equally important. The same “white” LED can produce very different impressions on wood, fabric, ceramics or skin.

FAQ — color, light and perception