模块:Color contrast/doc

此模块主要用于以下模版：

{{Color contrast ratio}}

{{ColorToLum}} / {{RGBColorToLum}}

{{Color contrast conformance}}

{{Ensure AAA contrast ratio}}

{{Ensure AA contrast ratio}}

{{Greater color contrast ratio}}

此模版也用于以下模块：

Module:Navbox

Module:Userbox

Module:Episode list

并且用于以下模块的说明文档页面：

Module:College color

函数说明

• sRGB(v)：从sRGB色彩空间的非线性转换：此函数所用到的常数则是使用$\left({\frac {K_{0}+a}{1+a}}\right)^{\gamma }={\frac {K_{0}}{\phi }}$与$\gamma \left({\frac {K_{0}+a}{1+a}}\right)^{\gamma -1}\left({\frac {1}{1+a}}\right)={\frac {1}{\phi }}$这2个方程式代入$a=0.055$、$\gamma =2.4$得到$\phi =12.92$与$K_{0}=0.03928$
• rgbdec2lum(R,G,B)：从三原色光模式转成CIE XYZ的Y值
• hsl2lum(h,s,l)：从HSL色彩空间转成CIE XYZ的Y值，其中h所用的单位为度
• color2lum(c)：从HTML颜色转成CIE XYZ的Y值

用法

To use this module, you may use one of the above listed templates or invoke the module directly

To compute relative luminescence

{{ColorToLum|color}} or {{#invoke:Color contrast|lum|color}}

To compute a contrast ratio between two colors

{{Color contrast ratio|color1|color2|error=?}} or {{#invoke:Color contrast|ratio|color1|color2|error=?}}

To determine which of two colors (color2a and color2b) has the greater contrast ratio with a particular color (color1)

{{Greater color contrast ratio|color1|color2a|color2b}} or {{#invoke:Color contrast|greatercontrast|color1|color2a|color2b}}

To compute the contrast ratio between the background and text colors specified in a css style string

{{#invoke:Color contrast|styleratio|css style statement string|default background color|default text color}}