[C#]동그란 이미지 만들기

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
 
namespace App3CircularCrop
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
            using(OpenFileDialog openFileDialog = new OpenFileDialog())
            {
                if (openFileDialog.ShowDialog() == DialogResult.OK)
                {                   
                    using (FileStream bmpSteam = new FileStream(openFileDialog.FileName, FileMode.Open))
                    {
                        Bitmap bmp = (Bitmap)Bitmap.FromStream(bmpSteam);
                        this.pictureBox1.Image = bmp;
                    }                    
                    this.pictureBox2.Image = MakeCircularCrop();
                }
            }
            
        }
 
        private Image MakeCircularCrop()
        {
            Bitmap bitmap = new Bitmap(this.pictureBox1.Width, this.pictureBox1.Height);
            Graphics g = Graphics.FromImage(bitmap);
            
            GraphicsPath path = new GraphicsPath();
            path.AddEllipse(0, 0, this.pictureBox1.Width, this.pictureBox1.Height);
            Region region = new Region(path);
            g.SetClip(region, CombineMode.Replace);
            Bitmap bmp = (Bitmap)this.pictureBox1.Image;
            g.DrawImage(bmp, new Rectangle(0, 0, this.pictureBox1.Width, this.pictureBox1.Height)
                           , new Rectangle(0, 0, this.pictureBox2.Width, this.pictureBox2.Height)
                           , GraphicsUnit.Pixel);
 
            return bitmap;
        }
    }
}

실행

참조 : http://codevlog.com/crop-image-in-star-shape-using-c/396