How to fill part of the image with color?

Question

I have a bitmap:

I draw a rectangle in this image:

Bitmap myImage = new Bitmap("path"); using (Graphics gr = Graphics.FromImage(myImage)) { Pen pen = new Pen(Color.Black, 2); gr.DrawRectangle(pen, 100,100, 100, 200); } 

I want to fill the entire image with black except for the rectangle. Like this:

Any idea how to implement it?

Answer 1

A simple ExcludeClip will do:

 using (Graphics g = Graphics.FromImage(myImage)) { g.ExcludeClip(new Rectangle(100, 100, 100, 200)); g.Clear(Color.Black); }