人的眼睛没有客观地感知光的能力 - 这是其主要缺点之一。同样，由于其自动适应不同的光水平，因此无法量化绝对亮度水平。
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量化颜色时，眼睛会遇到相同的问题，这是光的关键特征。
光的颜色
Triggering the three cone types in various proportions enable people to perceive millions of different colors. How these colors are actually perceived varies between persons as each person’s eyes show a different physical response.
周围的条件起着同样重要的作用，例如，日出，中午或日落的日光光谱是完全不同的。
A green leaf seems to have different colors during a day. Still, people will perceive the color to be the same as their brain automatically compensates for the influence of the light source by ‘knowing’ what color the object should be.
Texture, cultural background, size and the presence of other colors can all have an influence on how people see a color. This reveals that keeping the conditions constant is key for accurate color measurement.
Next to the influenced and biased human vision of color perception, communicating perceived colors is limited a person’s vocabulary and often relates only to what is objectively known as hue.
A general way of understandable color communication is based on three parameters: hue, chroma and value. Hue refers to what people commonly talk about as color and explains whether something is yellow, red, blue etc. Chroma explains the saturation or vividness of a color. Value or lightness describes the brightness of an object in comparison with a perfect white reference.
颜色和繁殖的差异
Keeping the conditions constant during color assessment is key as colors may appear differently under different types of lighting. Even two light sources that seem to have the same color as they trigger the cones in the eye in a similar way may result in objects being perceived differently.
由于白光源可以具有不同的光谱分布，因此物体反射的波长的混合物可能不同，这会影响感知的颜色。这种效果称为metamerism。有必要具有光源和良好的颜色渲染能力，以准确地繁殖和评估颜色。
A long-term standard used to describe the rendering capabilities of a light source is called the color rendering index (CRI), Ra, which can have a value of up to 100.
具有连续光谱的光源，包括可见光谱的所有波长，通常具有完美的渲染功能，从而导致高RA值。
For instance, the Ra value of daylight is 100. Light sources with discontinuous spectrums that lack parts of the visible spectrum logically have lower Ra values. Still, different types of light sources, both continuous and discontinuous, can appear white to the human eye like the examples below.
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This information has been sourced, reviewed and adapted from materials provided by Admesy.
有关此消息来源的更多信息，请访问Admesy。