[C#/WINFORM] ImageAttributes 클래스 : 채널 이미지 구하기

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.redPictureBox.Image   = GetChannelImage(this.sourcePictureBox.Image, 1, 0, 0, 1);
            this.greenPictureBox.Image = GetChannelImage(this.sourcePictureBox.Image, 0, 1, 0, 1);
            this.bluePictureBox.Image  = GetChannelImage(this.sourcePictureBox.Image, 0, 0, 1, 1);
        }

        #endregion

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

        #region 채널 이미지 구하기 - GetChannelImage(sourceImage, red, green, blue, alpha)

        /// <summary>
        /// 채널 이미지 구하기
        /// </summary>
        /// <param name="sourceImage">소스 이미지</param>
        /// <param name="red">빨강색 채널</param>
        /// <param name="green">녹색 채널</param>
        /// <param name="blue">파랑색 채널</param>
        /// <param name="alpha">투명도 채널</param>
        /// <returns>비트맵</returns>
        private Bitmap GetChannelImage(Image sourceImage, float red, float green, float blue, float alpha)
        {
            ColorMatrix colorMatrix = new ColorMatrix
            (
                new float[][]
                {
                    new float[] {red, 0    , 0   , 0    , 0 },
                    new float[] {0  , green, 0   , 0    , 0 },
                    new float[] {0  , 0    , blue, 0    , 0 },
                    new float[] {0  , 0    , 0   , alpha, 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
    }
}