.NETにおける画像処理

    Graphics g = Graphics.FromImage(dest);

    g.DrawImage(src, 0, 0);

    g.Dispose();

    Graphics g = Graphics.FromImage(dest);

    Rectangle destRect = new Rectangle(m_aWidth*x, m_aHeight*y, m_aWidth, m_aHeight);

    g.DrawImage(bmp, destRect, 0, 0, m_aWidth, m_aHeight, GraphicsUnit.Pixel);

    g.Dispose();

    Bitmap clipSrc = (Bitmap)Clipboard.GetImage();

    MessageBox.Show("" + clipSrc.PixelFormat);

    Bitmap clipSrc = (Bitmap)Clipboard.GetImage();

    Rectangle r = new Rectangle(0, 0, clipSrc.Width, clipSrc.Height);

    Bitmap clip = clipSrc.Clone(r, System.Drawing.Imaging.PixelFormat.Format32bppArgb);

    for (int i = 0; i < height; i++)

    {

      for (int j = 0; j < width; j++)

      {

        Color c = clip.GetPixel(j, i);

        Color tc = Color.FromArgb(128, c);

        clip.SetPixel(j, i, tc);

      }

    }

    for (int i = 0; i < height; i++)

    {

      for (int j = 0; j < width; j++)

      {

        Color c = clip.GetPixel(j, i);

        Color tc = Color.FromArgb(128, c);

        clip.SetPixel(j, i, tc);

      }

    }

    float opacity = 0.5F;

    System.Drawing.Imaging.ColorMatrix cm =

        new System.Drawing.Imaging.ColorMatrix();

    cm.Matrix00 = 1;

    cm.Matrix11 = 1;

    cm.Matrix22 = 1;

    cm.Matrix33 = opacity;

    cm.Matrix44 = 1;

    System.Drawing.Imaging.ImageAttributes ia =

        new System.Drawing.Imaging.ImageAttributes();

    ia.SetColorMatrix(cm);