确定RGB颜色感知亮度的公式 [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.我知道这不是将 RGB 值加在一起那么简单，总和越高越亮，但我有点不知从何开始.

解决方案

该方法可能因您的需要而异.以下是 3 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 @MatthewHerbst) 来源

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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