■ Bitmap 클래스에서 바이-톤 필터(Bi-tonal Filter)를 사용하는 방법을 보여준다.
▶ BitmapHelper.cs
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using System.Drawing; using System.Drawing.Imaging; using System.Runtime.InteropServices; using System.Drawing.Drawing2D; namespace TestProject { /// <summary> /// 비트맵 헬퍼 /// </summary> public static class BitmapHelper { //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Public #region 비트맵 구하기 - GetBitmap(sourceBitmap, targetWidth) /// <summary> /// 비트맵 구하기 /// </summary> /// <param name="sourceBitmap">소스 비트맵</param> /// <param name="targetWidth">타겟 너비</param> /// <returns>비트맵</returns> public static Bitmap GetBitmap(Bitmap sourceBitmap, int targetWidth) { int maximumSide = sourceBitmap.Width > sourceBitmap.Height ? sourceBitmap.Width : sourceBitmap.Height; float ratio = (float)maximumSide / (float)targetWidth; Bitmap targetBitmap = (sourceBitmap.Width > sourceBitmap.Height ? new Bitmap(targetWidth, (int)(sourceBitmap.Height / ratio)) : new Bitmap((int)(sourceBitmap.Width / ratio), targetWidth)); using(Graphics targetGraphics = Graphics.FromImage(targetBitmap)) { targetGraphics.CompositingQuality = CompositingQuality.HighQuality; targetGraphics.InterpolationMode = InterpolationMode.HighQualityBicubic; targetGraphics.PixelOffsetMode = PixelOffsetMode.HighQuality; targetGraphics.DrawImage ( sourceBitmap, new Rectangle(0, 0, targetBitmap.Width, targetBitmap.Height), new Rectangle(0, 0, sourceBitmap.Width, sourceBitmap.Height), GraphicsUnit.Pixel ); targetGraphics.Flush(); } return targetBitmap; } #endregion #region 바이-톤 필터 적용하기 - ApplyBitonalFilter(sourceBitmap, darkColor, lightColor, threshold) /// <summary> /// 바이-톤 필터 적용하기 /// </summary> /// <param name="sourceBitmap">소스 비트맵</param> /// <param name="darkColor">어두운 색상</param> /// <param name="lightColor">밝은 색상</param> /// <param name="threshold">임계치</param> /// <returns>비트맵</returns> public static Bitmap ApplyBitonalFilter(Bitmap sourceBitmap, Color darkColor, Color lightColor, int threshold) { BitmapData sourceBitmapData = sourceBitmap.LockBits ( new Rectangle(0, 0, sourceBitmap.Width, sourceBitmap.Height), ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb ); byte[] targetByteArray = new byte[sourceBitmapData.Stride * sourceBitmapData.Height]; Marshal.Copy(sourceBitmapData.Scan0, targetByteArray, 0, targetByteArray.Length); sourceBitmap.UnlockBits(sourceBitmapData); for(int i = 0; i + 4 < targetByteArray.Length; i += 4) { if (targetByteArray[i] + targetByteArray[i + 1] + targetByteArray[i + 2] <= threshold) { targetByteArray[i ] = darkColor.B; targetByteArray[i + 1] = darkColor.G; targetByteArray[i + 2] = darkColor.R; } else { targetByteArray[i ] = lightColor.B; targetByteArray[i + 1] = lightColor.G; targetByteArray[i + 2] = lightColor.R; } } Bitmap targetBitmap = new Bitmap(sourceBitmap.Width, sourceBitmap.Height); BitmapData targetBitmapData = targetBitmap.LockBits ( new Rectangle(0, 0, targetBitmap.Width, targetBitmap.Height), ImageLockMode.WriteOnly, PixelFormat.Format32bppArgb ); Marshal.Copy(targetByteArray, 0, targetBitmapData.Scan0, targetByteArray.Length); targetBitmap.UnlockBits(targetBitmapData); return targetBitmap; } #endregion } } |
▶ MainForm.cs
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using System; using System.Drawing; using System.Drawing.Imaging; using System.IO; using System.Windows.Forms; namespace TestProject { /// <summary> /// 메인 폼 /// </summary> public partial class MainForm : Form { //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// 소스 비트맵 /// </summary> private Bitmap sourceBitmap = null; /// <summary> /// 미리보기 비트맵 /// </summary> private Bitmap previewBitmap = null; /// <summary> /// 타겟 비트맵 /// </summary> private Bitmap targetBitmap = null; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - MainForm() /// <summary> /// 생성자 /// </summary> public MainForm() { InitializeComponent(); this.darkColorPanel.Click += colorPanel_Click; this.lightColorPanel.Click += colorPanel_Click; this.thresholdTrackBar.ValueChanged += thresholdTrackBar_ValueChanged; this.loadImageButton.Click += localImageButton_Click; this.saveImageButton.Click += saveImageButton_Click; } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Private //////////////////////////////////////////////////////////////////////////////// Event #region 색상 패널 클릭시 처리하기 - colorPanel_Click(sender, e) /// <summary> /// 색상 패널 클릭시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void colorPanel_Click(object sender, EventArgs e) { if(sender is Panel) { Panel panel = (Panel)sender; ColorDialog colorDialog = new ColorDialog(); colorDialog.AllowFullOpen = true; colorDialog.Color = panel.BackColor; colorDialog.FullOpen = true; if(colorDialog.ShowDialog() == DialogResult.OK) { panel.BackColor = colorDialog.Color; ApplyFilter(true); } } } #endregion #region 임계치 트랙바 값 변경시 처리하기 - thresholdTrackBar_ValueChanged(sender, e) /// <summary> /// 임계치 트랙바 값 변경시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void thresholdTrackBar_ValueChanged(object sender, EventArgs e) { this.thresholdValueLabel.Text = this.thresholdTrackBar.Value.ToString(); ApplyFilter(true); } #endregion #region 이미지 로드 버튼 클릭시 처리하기 - localImageButton_Click(sender, e) /// <summary> /// 이미지 로드 버튼 클릭시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void localImageButton_Click(object sender, EventArgs e) { OpenFileDialog openFileDialog = new OpenFileDialog(); openFileDialog.Title = "이미지 파일 로드"; openFileDialog.Filter = "PNG 이미지(*.png)|*.png|JPEG 이미지(*.jpg)|*.jpg|비트맵 이미지(*.bmp)|*.bmp"; if(openFileDialog.ShowDialog() == DialogResult.OK) { StreamReader streamReader = new StreamReader(openFileDialog.FileName); this.sourceBitmap = Bitmap.FromStream(streamReader.BaseStream) as Bitmap; streamReader.Close(); this.previewBitmap = BitmapHelper.GetBitmap(this.sourceBitmap, this.pictureBox.Width); this.pictureBox.Image = this.previewBitmap; ApplyFilter(true); } } #endregion #region 이미지 저장 버튼 클릭시 처리하기 - saveImageButton_Click(sender, e) /// <summary> /// 이미지 저장 버튼 클릭시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void saveImageButton_Click(object sender, EventArgs e) { ApplyFilter(false); if(this.targetBitmap != null) { SaveFileDialog saveFileDialog = new SaveFileDialog(); saveFileDialog.Title = "이미지 파일 저장"; saveFileDialog.Filter = "PNG 이미지(*.png)|*.png|JPEG 이미지(*.jpg)|*.jpg|비트맵 이미지(*.bmp)|*.bmp"; if(saveFileDialog.ShowDialog() == DialogResult.OK) { string fileExtension = Path.GetExtension(saveFileDialog.FileName).ToUpper(); ImageFormat imageFormat = ImageFormat.Png; if(fileExtension == "BMP") { imageFormat = ImageFormat.Bmp; } else if(fileExtension == "JPG") { imageFormat = ImageFormat.Jpeg; } StreamWriter streamWriter = new StreamWriter(saveFileDialog.FileName, false); this.targetBitmap.Save(streamWriter.BaseStream, imageFormat); streamWriter.Flush(); streamWriter.Close(); this.targetBitmap = null; } } } #endregion //////////////////////////////////////////////////////////////////////////////// Function #region 필터 적용하기 - ApplyFilter(preview) /// <summary> /// 필터 적용하기 /// </summary> /// <param name="preview">미리보기 여부</param> private void ApplyFilter(bool preview) { if(this.previewBitmap == null) { return; } if(preview == true) { this.pictureBox.Image = BitmapHelper.ApplyBitonalFilter ( this.previewBitmap, this.darkColorPanel.BackColor, this.lightColorPanel.BackColor, this.thresholdTrackBar.Value ); } else { this.targetBitmap = BitmapHelper.ApplyBitonalFilter ( this.sourceBitmap, this.darkColorPanel.BackColor, this.lightColorPanel.BackColor, this.thresholdTrackBar.Value ); } } #endregion } } |
