根据 http://www.workwithcolor.com/color-luminance-2233。 HTM ，红色（＃FF0000）具有亮度：54％。和浅粉色（＃FF8080）具有亮度：89％。我们的设计师喜欢它，但它是如何确定的？试一下： http://www.workwithcolor.com/hsl-color-schemer- 01.htm

According to http://www.workwithcolor.com/color-luminance-2233.htm, RED (#FF0000) has Luminance: 54%. and light pink (#FF8080) has Luminance: 89%. Our designers like it but how is it determined? Try here: http://www.workwithcolor.com/hsl-color-schemer-01.htm

我试图用公布的W3C 相对亮度公式，虽然范围为[ 0,1]，红色是 0.21 和白色是 1.00 。

I tried using relative luminance formula published by W3C and although the range is [0,1], red is 0.21 and white is 1.00.

我在想，也许什么workwithcolor确实是第一次变相的颜色为灰度，​​并宣读了灰色的亮度。我尝试过，但它仍然无法产生相同的结果。

I'm thinking, maybe what workwithcolor does is first covert the color into grayscale, and read the luminance of the gray. I tried it but it still doesn't give the same result.

我试过到目前为止： http://jsfiddle.net/HytZQ/

推荐答案

在这里查看公式： Formula确定RGB颜色亮度

Check the formula here: Formula to determine brightness of RGB color

Luminance (standard, objective): (0.2126*R) + (0.7152*G) + (0.0722*B)

把R = 255，G = B = 0，你会得到54

Put R=255, and G=B=0, you'll get 54

编辑： 对相对亮度，除以最大值（255） 你会得到21％

For relative luminance, divide by the maximum (255) you get 21%

有关白，你就会得到100％

For white, you get 100%