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.Threading.Tasks;
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();

            Bitmap sourceBitmap = Bitmap.FromFile("image.jpg") as Bitmap;

            Bitmap targetBitmap = sourceBitmap.Clone() as Bitmap;
            
            ProcessBitmap(targetBitmap);

            this.sourcePictureBox.Image = sourceBitmap;
            this.targetPictureBox.Image = targetBitmap;
        }

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Method
        ////////////////////////////////////////////////////////////////////////////////////////// Private

        #region 비트맵 처리하기 - ProcessBitmap(targetBitmap)

        /// <summary>
        /// 비트맵 처리하기
        /// </summary>
        /// <param name="targetBitmap">타겟 비트맵</param>
        private void ProcessBitmap(Bitmap targetBitmap)
        {
            int targetBitmapWidth  = targetBitmap.Width;
            int targetBitmapHeight = targetBitmap.Height;

            BitmapData targetBitmapData = targetBitmap.LockBits
            (
                new Rectangle(0, 0, targetBitmapWidth, targetBitmapHeight),
                ImageLockMode.ReadWrite,
                PixelFormat.Format24bppRgb
            );

            int targetBitmapStride = targetBitmapData.Stride;

            IntPtr scan0Handle = targetBitmapData.Scan0;

            unsafe
            {
                byte* pointer = (byte*)(void*)scan0Handle;

                Parallel.For
                (
                    0,
                    targetBitmapHeight,
                    y => {

                        Parallel.For
                        (
                            0,
                            targetBitmapWidth,
                            x => {

                                int position = y * targetBitmapStride + x * 3;

                                pointer[position + 2] = 0;
                            }
                        );
                    }
                );
            }

            targetBitmap.UnlockBits(targetBitmapData);
        }

        #endregion
    }
}
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