• The wavelengths of the primary colors C1, C2 , and C3 are standardized internationally. They are the spectral colors with the wavelengths 700nm (red), 546nm (green), and 435 nm (blue). 同色异谱现象简单来说就是颜色相同，而光谱组成不同。一种颜色 的再现与观察颜色的光源特性有一定的关系，某两种物质在一种光 源下呈现相同的颜色，但在另一种光源下，却呈现不同的颜色，这 种现象就叫同色异谱现象。
• Rods(杆状细胞) are more spread out and are sensitive to low levels of illumination with low spatial resolution.
人眼可以轻约几十个灰度 级。
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• 人眼成像过程
视觉 ＝ “视” ＋ “觉”
2
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• electromagnetic spectrum
400nm~700nm
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Index
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1. Human Vision System 2. CIE Chromaticity Diagrams 3. Color Space
1
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• Absorption curves for the different cones have been determined experimentally
7
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8
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• Hue Saturation Value
H
I
S
9
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• additive color mixture (Red, green, blue) and subtractive color mixture (cyan, magenta, yellow)
10
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• cones and rods
5
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• Cones(锥状细胞) are concentrated around the fovea(中心 凹) and are very sensitive to color with high spatial resolution
• Metamerism(同色异谱) implies that two objects that appear to have exactly the same color may have very different colors under differing lighting conditions.
3
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• Simplified representation of the human eye
4
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• The colors that we perceive in our environment are divided into two classes: chromatic(彩色) and achromatic(灰 度).
• The chromatic colors can be characterized by three components: hue, saturation, and luminance – Hue describes the type of chromaticity a color has and is indicated generally with words such as red, yellow, and blue. – Saturation describes the purity of a color, or the measure of the degree to which a pure color is diluted by white light. As saturation decreases, colors appear more faded. – Luminance indicates the strength of light sensitivity as it is connected to each color sensitivity. The greater the strength of the lighting, the lighter the color appears.
6
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• Approximately 65% of these cones are sensitive to red light, 33% to green light and 2% to blue light