Lab Color space vs RGB

[Dzung Nguyen]

Is it true that Lab color space is larger than RGB color space? For 
example, there exists a color in Lab that can't be reproduced in RGB space 
( outside of monitor's gamut)? How does the function rgb2lab deal with this 
case? From the code, I saw that there's always a corresponding mapping one 
to one between Lab and RGB.


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