色度学基础
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• Rods(杆状细胞) are more spread out and are sensitive to low levels of illumination with low spatial resolution.
人眼可以轻松区 分上千种颜色， 但在固定的光照 条件下，只能区 分约几十个灰度 级。
Receptoral Color Information
• Hue Saturation Value
H
I
S
Trichromatic Theory
• additive color mixture (Red, green, blue) and subtractive color mixture (cyan, magenta, yellow)
EYE AND COLOR
• Approximately 65% of these cones are sensitive to red light, 33% to green light and 2% to blue light
• Absorption curves for the different cones have been determined experimentally
• 基于同色异谱油墨的印刷技术的货币防伪：在可见光波段，两种油墨视觉效 果一致，而在紫外光照射下，两种油墨颜色不同，并且光谱特征也不一样， 这样可以达到双重防伪的功效。
Standard Color System
• Grassmann's First Law of color mixture: The quantities of primary colors R, G, B in the mixed color M are indicated by R, G, and B.
Metamerism
• 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.
EYE AND COLOR
• Simplified representation of the human eye
EYE AND COLOR
• cones and rods
EYE AND COLOR
• Cones(锥状细胞) are concentrated around the fovea(中心 凹) and are very sensitive to color with high spatial resolution
• The quantities of primary colors can be assumed to be negative in the color blending
• 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。
Metamerism
• 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。
• 现象1：现实生活中，在商场、超市购物时，在荧光灯下颜色一致的袜子或手 套，买回家后在白炽灯下颜色却不一样了。
– 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.
– 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.
Index
1. Human Vision System 2. CIE Chromaticity Diagrams 3. Color Space
EYE AND COLOR
• 人眼成像Leabharlann Baidu程
视觉 ＝ “视” ＋ “觉”
EYE AND COLOR
• electromagnetic spectrum
400nm~700nm
Receptoral Color Information
• 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
人眼可以轻松区 分上千种颜色， 但在固定的光照 条件下，只能区 分约几十个灰度 级。
Receptoral Color Information
• Hue Saturation Value
H
I
S
Trichromatic Theory
• additive color mixture (Red, green, blue) and subtractive color mixture (cyan, magenta, yellow)
EYE AND COLOR
• Approximately 65% of these cones are sensitive to red light, 33% to green light and 2% to blue light
• Absorption curves for the different cones have been determined experimentally
• 基于同色异谱油墨的印刷技术的货币防伪：在可见光波段，两种油墨视觉效 果一致，而在紫外光照射下，两种油墨颜色不同，并且光谱特征也不一样， 这样可以达到双重防伪的功效。
Standard Color System
• Grassmann's First Law of color mixture: The quantities of primary colors R, G, B in the mixed color M are indicated by R, G, and B.
Metamerism
• 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.
EYE AND COLOR
• Simplified representation of the human eye
EYE AND COLOR
• cones and rods
EYE AND COLOR
• Cones(锥状细胞) are concentrated around the fovea(中心 凹) and are very sensitive to color with high spatial resolution
• The quantities of primary colors can be assumed to be negative in the color blending
• 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。
Metamerism
• 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。
• 现象1：现实生活中，在商场、超市购物时，在荧光灯下颜色一致的袜子或手 套，买回家后在白炽灯下颜色却不一样了。
– 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.
– 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.
Index
1. Human Vision System 2. CIE Chromaticity Diagrams 3. Color Space
EYE AND COLOR
• 人眼成像Leabharlann Baidu程
视觉 ＝ “视” ＋ “觉”
EYE AND COLOR
• electromagnetic spectrum
400nm~700nm
Receptoral Color Information
• 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