RGB color Binary

Principle: RGB Color According to the calculation of ' grayscale ' formula, can be converted to black and white 2 colors, achieve two value.

Business Scenario Application: Depending on the background color, take a black or white color, as the background color of the copy font color

Specific code:

    function GetTextColor (backgroundcolor) {        var threshold = 128;//Threshold        var r = parseint (Backgroundcolor.substring ( 0,2) * 0.3;        var g = parseint (backgroundcolor.substring (2,4), +) * 0.59;        var B = parseint (Backgroundcolor.substring (4,6), +) * 0.11;        var RGB = r + G + b;//first grayscale the image        if (RGB > Threshold)//And then by a threshold value of binary        {            return "000000";        } else        {            return "FFFFFF";        }    }

　　

RGB color Binary