确定RGB颜色的感知亮度的公式 [英] Formula to determine perceived brightness of RGB color

问题描述

我正在寻找某种公式或算法来确定给定RGB值的颜色的亮度.我知道这不像将RGB值相加并使总和更高更明亮一样简单，但是我对于从哪里开始感到迷茫.

解决方案

该方法可能因您的需要而异.以下是三种计算亮度的方法:

• 亮度(某些颜色空间的标准):(0.2126 * R + 0.7152 * G + 0.0722 * B)

• 亮度(感知选项2，计算速度较慢): sqrt(0.241 * R ^ 2 + 0.691 * G ^ 2 + 0.068 * B ^ 2) → sqrt(0.299 * R ^ 2 + 0.587 * G ^ 2 + 0.114 * B ^ 2)(感谢源

I'm looking for some kind of formula or algorithm to determine the brightness of a color given the RGB values. I know it can't be as simple as adding the RGB values together and having higher sums be brighter, but I'm kind of at a loss as to where to start.

解决方案

The method could vary depending on your needs. Here are 3 ways to calculate Luminance:

• Luminance (standard for certain colour spaces): (0.2126*R + 0.7152*G + 0.0722*B) source

• Luminance (perceived option 1): (0.299*R + 0.587*G + 0.114*B) source

• Luminance (perceived option 2, slower to calculate): sqrt( 0.241*R^2 + 0.691*G^2 + 0.068*B^2 ) → sqrt( 0.299*R^2 + 0.587*G^2 + 0.114*B^2 ) (thanks to @MatthewHerbst) source

^{_{[Edit: added examples using named css colors sorted with each method.]}}

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