비트맵 리사이징 메써드

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApplication6
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        public static Bitmap ResizeBitmap(Bitmap bmp, float ratio, InterpolationMode im)
        {
            int w = bmp.Width;
            int h = bmp.Height;

            Bitmap tmp = new Bitmap((int)(w * ratio), (int)(h * ratio), bmp.PixelFormat);

            Graphics g = Graphics.FromImage(tmp);
            g.InterpolationMode = im;
            g.DrawImage(bmp, new RectangleF(0f, 0f, w * ratio, h * ratio));
            g.Dispose();

            return tmp;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Bitmap bmp = new Bitmap(@"C:\Users\sgi320\Desktop\lena.bmp");

            Bitmap tmp;
            int w, h;
            float ratio = 0.5f;

            Graphics g = this.CreateGraphics();

            tmp = ResizeBitmap(bmp, ratio, InterpolationMode.Bicubic);
            g.DrawImageUnscaled(tmp, 5, 5);
            w = tmp.Width;
            h = tmp.Height;
            tmp.Dispose();
        }
    }
}