| When you see colors, there must be an object, light and eyes. There is every visible wave length of light in sunlight, on the other hand there are mainly orange-yellow wavelengths in incandescent light. If the light is different, then the received colors can be seen differently because the surface of an object reflects the light in different ways.
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 Under the sunlight, an incandescent light, a fluorescent light
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But human eyes can adjust the colors automatically, if you think the T-shirt is white, then your eyes can adjust the natural T-shirt as white.
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There are many tricks in recognizing colors. The followings are some effects caused by your eyes:
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  "Hue Assimilation" Which yellow is brighter?
   same yellow
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"Border Contrast" Each color looks like gradation..
 all solid colors. |
"Brightness Contrast" Which gray is lighter?
  same gray
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