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📘 Why Do Colors Look Different Under Different Light?

Color is not a paint label traveling unchanged from an object to your eye. A lamp or the Sun supplies light, the surface filters it by absorbing and reflecting wavelengths, and the mixture entering your eye produces a color sensation. If a

4
lessons
~20 min
to learn
Adults
level
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What you’ll learn

  1. Light Is Part of the ColorExplain why illumination and reflectance jointly determine the light entering the eye.A surface can only reflect wavelengths supplied by its light source.
  2. Sources Have Different SpectraDistinguish color temperature from a complete description of a lamp's spectrum.Sources with similar warmth can distribute wavelengths differently.
  3. Your Brain Estimates ColorConnect spectra and reflectance to cone responses, metamerism, and color constancy.The eye compares cone signals while the visual system estimates the illuminant from scene regularities.
  4. Why Matches Still FailApply color science to lighting choices and color-rendering limits.Important colors should be checked under their actual intended illumination.

Questions this course answers

Why can a red sweater look dull under one lamp?

The visible result depends on both the source spectrum and the surface reflectance.

Order the path from lamp to color perception.

The source is filtered by the surface before cone signals are compared.

Match each term to its role.

These terms describe different links in the light-to-perception chain.

Why can two matching paint samples separate under a new lamp?

A match under one illuminant is conditional; a different spectrum can reveal different reflected mixtures.

Grounded in trusted sources

  • OpenStax College Physics 2e, Color and Color Vision - https://openstax.org/books/college-physics-2e/pages/26-3-color-and-color-vision
  • OpenStax Anatomy and Physiology, Sensory Perception - https://openstax.org/books/anatomy-and-physiology/pages/14-1-sensory-perception
  • NIST, Fundamentals for Color Measurements - https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=841491
  • NIST, Color Rendering of Light Sources - https://www.nist.gov/pml/sensor-science/optical-radiation/color-rendering-light-sources
  • Foster, Color constancy, PubMed - https://pubmed.ncbi.nlm.nih.gov/20849875/
  • Wandell et al., Sensory, computational and cognitive components of human colour constancy, PMC - https://pmc.ncbi.nlm.nih.gov/articles/PMC1609194/
  • Mechanisms of human color constancy underpinning stable visual perception, PMC - https://pmc.ncbi.nlm.nih.gov/articles/PMC7618667/

Every Wunder lesson is built from real, reputable sources — never invented.

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