What Differentiates Bright Light from White Light in Human Perception?

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Discussion Overview

The discussion explores how human perception differentiates between various light sources, particularly focusing on the distinction between bright light and white light as observed on surfaces like a whiteboard. It touches on concepts of color perception, illumination, and the effects of surrounding colors.

Discussion Character

  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant questions how our eyes and brain differentiate between the appearance of a whiteboard under normal lighting and when illuminated by bright sunlight.
  • Another participant suggests that there are various shades of "white," noting that direct sunlight has a slightly yellow tint compared to a whiteboard, which can affect perception.
  • A different participant raises the concept of illumination, asking if that is what is meant by the difference in perception.
  • One participant elaborates on the complexity of color perception, mentioning spectral and non-spectral colors, the impact of luminance and shading, and how surrounding colors can influence the perception of an object's color.

Areas of Agreement / Disagreement

Participants express differing views on the factors influencing color perception and the specific distinctions between types of light. The discussion remains unresolved with multiple competing perspectives presented.

Contextual Notes

The discussion highlights the complexity of color perception and the influence of environmental factors, but does not resolve the specific mechanisms behind these perceptions or the definitions of terms used.

cjduncana
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What difference does our eyes detect when we see light, that our brain can differentiate between simply a whiteboard and the sun being reflected on a whiteboard? A whiteboard under normal circumstances looks white, yet when a bright light source is reflected on it, we notice it is not the same. It is a bright white whiteboard.
 
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hi cjduncana! welcome to pf! :smile:
cjduncana said:
What difference does our eyes detect when we see light, that our brain can differentiate between simply a whiteboard and the sun being reflected on a whiteboard?

there is a wide range of colours that we call "white"

direct sunlight is slightly more yellow than a whiteboard, so the whiteboard looks sunnier

you see the same effect in a garden when the sun comes out from behind a cloud … suddenly everything looks slightly yellower

if an artist paints an outdoor scene with sunlight falling on the canvas, the painting will look dull when viewed in ordinary light … but if he paints with the canvas in shadow, he will get the colours right

(art galleries in the northern hemisphere usually have windows that let in north light, since that is the nearest to "natural white")
 
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cjduncana said:
What difference does our eyes detect when we see light, that our brain can differentiate between simply a whiteboard and the sun being reflected on a whiteboard? A whiteboard under normal circumstances looks white, yet when a bright light source is reflected on it, we notice it is not the same. It is a bright white whiteboard.
Do you mean illumination?
 
Color perception is a complicated subject. Not only do you have spectral colors, IE those from light of a single wavelength, you also have non-spectral colors, which are caused by mixing various wavelengths together. On top of that you have to worry about luminance and shading, which can alter the perceived color. And to make it even more complicated, your brain can see the color of one object differently depending the color of objects that surround it!

http://en.wikipedia.org/wiki/Color_constancy
http://en.wikipedia.org/wiki/Color_vision
http://en.wikipedia.org/wiki/Chromatic_adaptation
 

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