-  
          
Different spectra can result in a perceptually identical sensations 
            called metamers 
         
        -  
          
Color perception results from the simultaneous stimulation of 3 
            cone types (trichromat) 
         
        -  
          
Our perception of color is also affected by surround effects and 
            adaptation 
         
        - Ex : Color 
          vs distance
 
          Simultaneous 
          Contrast  
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