Thanks to all...
i found solution for this problem. hope it will help someone..
public static void GetPinkingEffect()
{
int depth = 5;
Bitmap bmp = new Bitmap(@"C:\Users\Public\Pictures\Sample Pictures\Hydrangeas.jpg");
var CurvePoints = new List<Point>();
using (var g = Graphics.FromImage(bmp))
{
CurvePoints.Add(new Point(0, 0));
for (var i = 0; i < Math.Ceiling((Decimal)bmp.Width / (depth * 2)); i++)
{
CurvePoints.Add(new Point(5 + i * 10, depth));
CurvePoints.Add(new Point((i + 1) * 10, 0));
}
g.FillPolygon(new SolidBrush(Color.White), CurvePoints.ToArray());
}
bmp.Save(@"C:\Users\Public\Pictures\Sample Pictures\Pinking_Hydrangeas.jpg");
}