첨부 소스 코드는 나눔고딕코딩 폰트를 사용합니다.
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TestProject.zip
다운로드

▶ MainForm.cs

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Windows.Forms;

namespace TestProject
{
    /// <summary>
    /// 메인 폼
    /// </summary>
    public partial class MainForm : Form
    {
        //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor
        ////////////////////////////////////////////////////////////////////////////////////////// Public

        #region 생성자 - MainForm()

        /// <summary>
        /// 생성자
        /// </summary>
        public MainForm()
        {
            InitializeComponent();

            this.sourcePictureBox.Image = Image.FromFile("sample.jpg");

            #region 이벤트를 설정한다.

            Load += Form_Load;

            #endregion
        }

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Method
        ////////////////////////////////////////////////////////////////////////////////////////// Private
        //////////////////////////////////////////////////////////////////////////////// Event

        #region 폼 로드시 처리하기 - Form_Load(sender, e)

        /// <summary>
        /// 폼 로드시 처리하기
        /// </summary>
        /// <param name="sender">이벤트 발생자</param>
        /// <param name="e">이벤트 인자</param>
        private void Form_Load(object sender, EventArgs e)
        {
            this.targetPictureBox.Image = GetSepiaImage(this.sourcePictureBox.Image);
        }

        #endregion

        //////////////////////////////////////////////////////////////////////////////// Function

        #region 세피아 이미지 구하기 - GetSepiaImage(sourceImage)

        /// <summary>
        /// 세피아 이미지 구하기
        /// </summary>
        /// <param name="sourceImage">소스 이미지</param>
        /// <returns>세피아 이미지</returns>
        private Bitmap GetSepiaImage(Image sourceImage)
        {
            ColorMatrix colorMatrix = new ColorMatrix
            (
                new float[][]
                {
                    new float[] { 0.393f, 0.349f, 0.272f, 0, 0 },
                    new float[] { 0.769f, 0.686f, 0.534f, 0, 0 },
                    new float[] { 0.189f, 0.168f, 0.131f, 0, 0 },
                    new float[] { 0     , 0     , 0     , 1, 0 },
                    new float[] { 0     , 0     , 0     , 0, 1 }
                }
            );

            ImageAttributes imageAttributes = new ImageAttributes();

            imageAttributes.SetColorMatrix(colorMatrix);

            Point[] pointArray =
            {
                new Point(0, 0),
                new Point(sourceImage.Width - 1, 0),
                new Point(0, sourceImage.Height - 1),
            };

            Rectangle rectangle = new Rectangle(0, 0, sourceImage.Width, sourceImage.Height);

            Bitmap bitmap = new Bitmap(sourceImage.Width, sourceImage.Height);

            using(Graphics graphics = Graphics.FromImage(bitmap))
            {
                graphics.DrawImage(sourceImage, pointArray, rectangle, GraphicsUnit.Pixel, imageAttributes);
            }

            return bitmap;
        }

        #endregion
    }
}
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