■ Bitmap 클래스에서 회색조/투명/네거티브/세피아 톤 필터를 사용하는 방법을 보여준다.
▶ BitmapHelper.cs
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using System; using System.Drawing; using System.Drawing.Imaging; using System.Runtime.InteropServices; namespace TestProject { /// <summary> /// 비트맵 /// </summary> public static class BitmapHelper { //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Public #region 투명 비트맵 구하기 - GetTransparentBitmap(sourceImage, alpha) /// <summary> /// 투명 비트맵 구하기 /// </summary> /// <param name="sourceImage">소스 이미지</param> /// <param name="alpha">알파</param> /// <returns>투명 비트맵</returns> public static Bitmap GetTransparentBitmap(Image sourceImage, byte alpha = 100) { Bitmap targetBitmap = GetBitmap(sourceImage); BitmapData targetBitmapData = targetBitmap.LockBits ( new Rectangle(0, 0, sourceImage.Width, sourceImage.Height), ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb ); IntPtr sourceHandle = targetBitmapData.Scan0; byte[] targetByteArray = new byte[targetBitmapData.Stride * targetBitmap.Height]; Marshal.Copy(sourceHandle, targetByteArray, 0, targetByteArray.Length); for(int i = 3; i < targetByteArray.Length; i += 4) { targetByteArray[i] = alpha; } Marshal.Copy(targetByteArray, 0, sourceHandle, targetByteArray.Length); targetBitmap.UnlockBits(targetBitmapData); targetBitmapData = null; targetByteArray = null; return targetBitmap; } #endregion #region 회색조 비트맵 구하기 - GetGrayscaleBitmap(sourceImage) /// <summary> /// 회색조 비트맵 구하기 /// </summary> /// <param name="sourceImage">소스 이미지</param> /// <returns>회색조 비트맵</returns> public static Bitmap GetGrayscaleBitmap(Image sourceImage) { Bitmap targetBitmap = GetBitmap(sourceImage); BitmapData targetBitmapData = targetBitmap.LockBits ( new Rectangle(0, 0, sourceImage.Width, sourceImage.Height), ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb ); IntPtr sourceHandle = targetBitmapData.Scan0; byte[] targetByteArray = new byte[targetBitmapData.Stride * targetBitmap.Height]; Marshal.Copy(sourceHandle, targetByteArray, 0, targetByteArray.Length); float rgb = 0; for(int i = 0; i < targetByteArray.Length; i += 4) { rgb = targetByteArray[i ] * 0.11f; rgb += targetByteArray[i + 1] * 0.59f; rgb += targetByteArray[i + 2] * 0.3f; targetByteArray[i ] = (byte)rgb; targetByteArray[i + 1] = targetByteArray[i]; targetByteArray[i + 2] = targetByteArray[i]; targetByteArray[i + 3] = 255; } Marshal.Copy(targetByteArray, 0, sourceHandle, targetByteArray.Length); targetBitmap.UnlockBits(targetBitmapData); targetBitmapData = null; targetByteArray = null; return targetBitmap; } #endregion #region 네거티브 비트맵 구하기 - GetNegativeBitmap(sourceImage) /// <summary> /// 네거티브 비트맵 구하기 /// </summary> /// <param name="sourceImage">소스 이미지</param> /// <returns>네거티브 비트맵</returns> public static Bitmap GetNegativeBitmap(Image sourceImage) { Bitmap targetBitmap = GetBitmap(sourceImage); BitmapData targetBitmapData = targetBitmap.LockBits ( new Rectangle(0, 0, sourceImage.Width, sourceImage.Height), ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb ); IntPtr sourceHandle = targetBitmapData.Scan0; byte[] targetByteArray = new byte[targetBitmapData.Stride * targetBitmap.Height]; Marshal.Copy(sourceHandle, targetByteArray, 0, targetByteArray.Length); byte[] pixelByteArray = null; int pixel = 0; for(int i = 0; i < targetByteArray.Length; i += 4) { pixel = ~BitConverter.ToInt32(targetByteArray, i); pixelByteArray = BitConverter.GetBytes(pixel); targetByteArray[i ] = pixelByteArray[0]; targetByteArray[i + 1] = pixelByteArray[1]; targetByteArray[i + 2] = pixelByteArray[2]; } Marshal.Copy(targetByteArray, 0, sourceHandle, targetByteArray.Length); targetBitmap.UnlockBits(targetBitmapData); targetBitmapData = null; targetByteArray = null; return targetBitmap; } #endregion #region 세피아 톤 비트맵 구하기 - GetSepiaToneBitmap(sourceImage) /// <summary> /// 세피아 톤 비트맵 구하기 /// </summary> /// <param name="sourceImage">소스 이미지</param> /// <returns>세피아 톤 비트맵</returns> public static Bitmap GetSepiaToneBitmap(Image sourceImage) { Bitmap targetBitmap = GetBitmap(sourceImage); BitmapData targetBitmapData = targetBitmap.LockBits ( new Rectangle(0, 0, sourceImage.Width, sourceImage.Height), ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb ); IntPtr sourceHandle = targetBitmapData.Scan0; byte[] targetByteArray = new byte[targetBitmapData.Stride * targetBitmap.Height]; Marshal.Copy(sourceHandle, targetByteArray, 0, targetByteArray.Length); byte maximumValue = 255; float red = 0; float green = 0; float blue = 0; for(int i = 0; i < targetByteArray.Length; i += 4) { red = targetByteArray[i] * 0.189f + targetByteArray[i + 1] * 0.769f + targetByteArray[i + 2] * 0.393f; green = targetByteArray[i] * 0.168f + targetByteArray[i + 1] * 0.686f + targetByteArray[i + 2] * 0.349f; blue = targetByteArray[i] * 0.131f + targetByteArray[i + 1] * 0.534f + targetByteArray[i + 2] * 0.272f; targetByteArray[i + 2] = (red > maximumValue ? maximumValue : (byte)red ); targetByteArray[i + 1] = (green > maximumValue ? maximumValue : (byte)green); targetByteArray[i ] = (blue > maximumValue ? maximumValue : (byte)blue ); } Marshal.Copy(targetByteArray, 0, sourceHandle, targetByteArray.Length); targetBitmap.UnlockBits(targetBitmapData); targetBitmapData = null; targetByteArray = null; return targetBitmap; } #endregion //////////////////////////////////////////////////////////////////////////////// Private #region 비트맵 구하기 - GetBitmap(sourceImage) /// <summary> /// 비트맵 구하기 /// </summary> /// <param name="sourceImage">소스 이미지</param> /// <returns>비트맵</returns> private static Bitmap GetBitmap(Image sourceImage) { Bitmap targetBitmap = new Bitmap ( sourceImage.Width, sourceImage.Height, PixelFormat.Format32bppArgb ); using(Graphics graphics = Graphics.FromImage(targetBitmap)) { graphics.DrawImage ( sourceImage, new Rectangle(0, 0, targetBitmap.Width, targetBitmap.Height), new Rectangle(0, 0, targetBitmap.Width, targetBitmap.Height), GraphicsUnit.Pixel ); graphics.Flush(); } return targetBitmap; } #endregion } } |
▶ MainForm.cs
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using System; using System.Drawing; using System.IO; 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.loadImageButton.Click += loadImageButton_Click; this.grayscaleImageRadioButton.CheckedChanged += imageRadioButton_CheckedChanged; this.transparencyImageRadioButton.CheckedChanged += imageRadioButton_CheckedChanged; this.negativeImageRadioButton.CheckedChanged += imageRadioButton_CheckedChanged; this.sepiaToneImageRadioButton.CheckedChanged += imageRadioButton_CheckedChanged; } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Private #region 이미지 로드 버튼 클릭시 처리하기 - loadImageButton_Click(sender, e) /// <summary> /// 이미지 로드 버튼 클릭시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void loadImageButton_Click(object sender, EventArgs e) { OpenFileDialog openFileDialog = new OpenFileDialog(); openFileDialog.Title = "이미지 파일 선택하기"; openFileDialog.Filter = "Png files (*.png)|*.png|Bitmap files (*.bmp)|*.bmp|Jpeg files (*.jpg)|*.jpg"; if(openFileDialog.ShowDialog() == DialogResult.OK) { StreamReader streamReader = new StreamReader(openFileDialog.FileName); Bitmap sourceBitmap = (Bitmap)Bitmap.FromStream(streamReader.BaseStream); streamReader.Close(); this.inputImagePanel.BackgroundImage = sourceBitmap; imageRadioButton_CheckedChanged(sender, e); } } #endregion #region 이미지 라디오 버튼 클릭시 처리하기 - imageRadioButton_CheckedChanged(sender, e) /// <summary> /// 이미지 라디오 버튼 클릭시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void imageRadioButton_CheckedChanged(object sender, EventArgs e) { if(this.inputImagePanel.BackgroundImage != null) { if(this.grayscaleImageRadioButton.Checked == true) { this.outputImagePanel.BackgroundImage = BitmapHelper.GetGrayscaleBitmap(this.inputImagePanel.BackgroundImage); } else if(this.transparencyImageRadioButton.Checked == true) { this.outputImagePanel.BackgroundImage = BitmapHelper.GetTransparentBitmap(this.inputImagePanel.BackgroundImage); } else if(this.negativeImageRadioButton.Checked == true) { this.outputImagePanel.BackgroundImage = BitmapHelper.GetNegativeBitmap(this.inputImagePanel.BackgroundImage); } else if(this.sepiaToneImageRadioButton.Checked == true) { this.outputImagePanel.BackgroundImage = BitmapHelper.GetSepiaToneBitmap(this.inputImagePanel.BackgroundImage); } } } #endregion } } |
