Color is light, interpreted

An object doesn't "contain" color. It absorbs some wavelengths of light and reflects others; the reflected wavelengths hit the eye and get interpreted by the brain as a color. A "red" apple isn't red inside — its surface reflects long-wavelength light and absorbs the rest. This is why the same object can look like a different color under different lighting: the light hitting it changed, not the object.

What a "color space" actually is

A color space is a defined system for describing and reproducing color numerically — a map of which colors a given method can represent, and how to specify any point on that map. RGB and CMYK (covered in an earlier article) are both color spaces, but they cover different ranges: RGB, built from light, can produce colors CMYK ink physically cannot reproduce, which is exactly why a color that looks perfect on screen can shift when printed. A color space is the honest boundary of what's actually achievable in a given medium.

Pigment: color you can hold

Pigment is a physical substance — a powder or particle mixed into paint, ink, or dye — that creates color by absorbing certain wavelengths of light and reflecting others. Unlike light-based color (which adds wavelengths together to get brighter, moving toward white), pigment-based color is subtractive: mixing pigments together removes more wavelengths and moves toward black. This is the physical reason mixing paint works differently from mixing colored light, and it's the deeper reason behind the RGB (light, additive) vs. CMYK (ink, subtractive) split.

Why this isn't just theory

  • A brand color chosen only by eye on a screen has no guarantee of surviving translation to a printed pigment — it needs an actual color space conversion, not a guess.
  • Two screens can show the same RGB value slightly differently depending on calibration — which is why professional print work references standardized systems (like Pantone) instead of "the color on my monitor."
  • Understanding that color is reflected light, not an inherent object property, explains why lighting conditions in product photography change how a product's color reads — a problem that's about physics, not the camera.