C#

// input:  Bitmap bm1, size w1*h1
// output: Bitmap bm2, size w2*h2
public Bitmap ResizeImageKeepingAspectRatio(Bitmap bm1, int w2, int h2, Brush backColor) {
    int w1=bm1.Width;
    int h1=bm1.Height;
    Bitmap bm2=new Bitmap(w2, h2);
    Graphics g=Graphics.FromImage(bm2);
    g.FillRectangle(backColor, 0, 0, w2, h2);
    int x2=0;
    int y2=0;
    float scale=1;
    if (w1*h2>w2*h1) {// w2 is the limiting factor
       y2=h2-h1*w2/w1);
       scale=w2/(float)w1;
    } else {          // h2 is the limiting factor
       x2=w2-w1*h2/h1);
       scale=h2/(float)h1;
    }
    g.ScaleTransform(scale, scale);
    g.TranslateTransform(x2/2, y2/2);
    g.DrawImage(bm1, 0, 0);
    g.Dispose();
    return bm2;
}

public Bitmap ResizeImageKeepingAspectRatio(Image bm1, int w2, int h2, Brush backColor, bool centered) 
{
			int w1=bm1.Width;
			int h1=bm1.Height;
			Bitmap bm2=new Bitmap(w2, h2);
			Graphics g=Graphics.FromImage(bm2);
			g.FillRectangle(backColor, 0, 0, w2, h2);
			int x2=0;
			int y2=0;
			float scale=1;
			if (w1*h2 > w2*h1) {// w2 is the limiting factor
			   if (centered) y2=h2*w1/w2-h1;
			   scale=w2/(float)w1;
			} else {          // h2 is the limiting factor
			   if (centered) x2=w2*h1/h2-w1;
			   scale=h2/(float)h1;
			}
			g.ScaleTransform(scale, scale);
			g.TranslateTransform(x2/2, y2/2);
			g.DrawImage(bm1, 0, 0);
			g.Dispose();
			return bm2;
		}

StaffImageList.ImageSize = new Size(120, 120);
this.StaffListView.View = View.LargeIcon;
StaffImageList.Images.Add(fPath, ResizeImageKeepingAspectRatio(img,StaffImageList.ImageSize.Width,StaffImageList.ImageSize.Height, brush, true));