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When you see colors, there must be an object, light and eyes. There are every visible wavelength of light in sunlight, on the other hand there are mainly orange-yellow wavelengths in incandescen light. If the light is different, then the actually-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, which is called "consistency". If you think the T-shirt is white, then your eyes can adjust the natural T-shirt as white.
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"Consistency"
You can adjust white because you have "a standard that this T-shirt
should be white" but you cannot adjust the image without a standard.
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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.
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"Brightness Contrast" Which gray is lighter?
 
same gray
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Now you can see that you see the way you want to see.
Human eyes can be easily effected by the surroundings. But only human eyes can judge colors. Believe what you see with your eyes but do not believe it too much.
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