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1
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2
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3
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- Because the cones can differentiate colors, there must be more than one
type of cones.
- Thomas Young (1801) postulated three types of cones --- Trichromacy,
based on the three attributes of color: hue, saturation, lightness.
- need three inputs to get three outputs
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4
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5
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6
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7
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- For white light, all cones respond equally.
- All wavelengths contribute equally to broad-band white light.
- An additive mixture of two complementary lights can also yield white.
- From the region of spectral colors without spectral complementary, we
determine where L & I and S & I responses cross.
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8
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9
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10
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11
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12
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- Consider matching 490-nm spectral cyan which excites the S and I-cones
equally and a little bit of L-cones.
- Use 460-nm blue and 530-nm green and 650-nm red to match cyan. The blue
and green must be roughly the same amount. However, this mixture excite
the L-cones too much, we need anti-red to de-excite the L-cones.
- The information contained in the chromaticity diagram is consistent with
that of the response curves.
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13
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14
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15
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16
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17
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18
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19
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20
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21
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22
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23
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24
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Notes
