色温图 Color temperature

Color temperature is a characteristic of visible light that has important applications in lighting, photography, videography, publishing, manufacturing, astrophysics, horticulture, and other fields. The color temperature of a light source is the temperatureof an ideal black-body radiator that radiates light of comparable hue to that of the light source. Color temperature is conventionally stated in the unit of absolute temperature, the kelvin, having the unit symbol K.

-WiKipedia

在摄影时,色温值低就会得到偏冷偏蓝调的照片;色温值调高就会得到偏暖偏黄的色彩。

世上的颜色,都在 CIE 1931-XYZ系统色度图的“舌形图”内,或边缘(单色)。边缘的数字是单色的波长。
图中一条“弓形线”是色温线,标有色温。
与色温线交叉的是“等温线”,此线上的(相关)色温都相同。色温线上每一个色温都有等温线,上图只有两条。
最左边的直线,是色温“无穷大”等温线,再左边(兰色区)就无色温了。
1000K左右偏红色,1500K到3000K偏黄色,以后黄色越来越淡,4500K起蓝色逐步增加,10000K后颜色带青。

正常环境的色温在5400k左右,即将白平衡设置为相应的数值则得到比较真实的色彩,不过就比较平淡,无法很好的表现环境。若将拍摄设置降低为37ook时,画面就会变蓝,呈现出冷调,而在9000k时则变得很红,如加强夕阳的效果。
问题:3D的色温图可以用来识别CGI和natural image吗?

 

 

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