c# - How do I adjust the brightness of a color?

Question

I would like to darken an existing color for use in a gradient brush. Could somebody tell me how to do this please?

C#, .net 2.0, GDI+

Answer 1

As a simple approach, you can just factor the RGB values:

    Color c1 = Color.Red;
    Color c2 = Color.FromArgb(c1.A,
        (int)(c1.R * 0.8), (int)(c1.G * 0.8), (int)(c1.B * 0.8));

(which should darken it; or, for example, * 1.25 to brighten it)