[my note]about gamma correction

最新推荐文章于 2020-09-23 20:25:48 发布

EndlessEpoch

最新推荐文章于 2020-09-23 20:25:48 发布

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分类专栏： color science

本文链接：https://blog.youkuaiyun.com/qq_15672023/article/details/77890124

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本文探讨了Gamma校正的概念及其在显示设备、人类视觉系统和摄影中的应用。解释了不同设备上的Gamma值差异，以及如何调整以匹配人眼的非线性响应。此外，还讨论了在摄影中如何使用Gamma校正来改善图像质量。

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Correct terminology:

1. Gamma, usually is 2.5 from CRT device because of lighting by voltage. LCD display has different gamma value, Besides, display device are not limited by gamma 2.5. However, new display still made with a gamma value. ex. Apple display is 1.8.

2. In human vision aspect, LMS cones have a non-linear response function. In dark, L = L^0.4; In bright, L = L^0.5; this response curve have no direct relationship with Gamma in display. they look alike, it is coincidence.

3. Gamma correction in Camera. Our eyes do not perceive light the way cameras do.

To make the image which captured from radiance close to eye perception, add a gamma 2.2 which based on sRGB.(most of display device use sRGB).

Credit to : http://www.cambridgeincolour.com/tutorials/gamma-correction.htm