How to darken a given color (int)

android android-color
NSouth picture NSouth · Oct 12, 2015 · Viewed 15k times · Source

I have a function that takes a given color and I would like it to darken the color (reduce its brightness by 20% or so). I can't figure out how to do this given just a color (int). What is the proper approach?

public static int returnDarkerColor(int color){
    int darkerColor = .... 
    return darkerColor;
}

Answer

Gary McGowan picture Gary McGowan · Oct 12, 2015

A more Android way of doing it:

    public static int manipulateColor(int color, float factor) {
        int a = Color.alpha(color);
        int r = Math.round(Color.red(color) * factor);
        int g = Math.round(Color.green(color) * factor);
        int b = Math.round(Color.blue(color) * factor);
        return Color.argb(a,
                Math.min(r,255),
                Math.min(g,255),
                Math.min(b,255));
    }

You will want to use a factor less than 1.0f to darken. try 0.8f.

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