Introduction to Color - Brown University

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CS123 | INTRODUCTION TO COMPUTER GRAPHICS Metamers (2/3) Consider a creature with two receptors (R1, R2) I 1 I 2 I 1 R 1 R 2 Both I 1 and I 2 are processed by (convolved with) the receptors R 1 and R 2 to form the same product Note that in principle, an infinite number of frequency distributions can simulate the effect of I 2 , e.g., I 1 in practice, near tails of response curves, amount of light required becomes impractically large Andries van Dam Color 40/57
CS123 | INTRODUCTION TO COMPUTER GRAPHICS Metamers (3/3) Whenever you have at least two receptors, there are potentially infinite color distributions that will generate identical sensations (metamers) Conversely, no two monochromatic lights can generate identical receptor responses - they all look unique Observations: If two people have different response curves, they will have different metamers Different people can distinguish between different colors Metamers are purely conceptual Scientific instruments can detect difference between two metameric lights Metamer Applet: http://www.cs.brown.edu/exploratories/freeSoftware/repository/edu/brown/c s/exploratories/applets/spectrum/metamers_guide.html Andries van Dam Color 41/57
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