本文实例为大家分享了C#图像处理的具体代码，供大家参考，具体内容如下
（1）在Form1窗体中的PictureBox1控件中显示通过OpenFileDialog指定的图像文件内容。
将SizeMode设置成StretchImage
private void 打开ToolStripMenuItem_Click(object sender, EventArgs e)
{
OpenFileDialog open = new OpenFileDialog();
open.Filter = "所有文件|*.*";
if (open.ShowDialog() == DialogResult.OK)
{
Bitmap im = new Bitmap(open.FileName);
pictureBox1.Image = im;
//pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;
}
}
（2）编制一个图像格式转换的应用程序，实现BMP图像与JPEG图像的格式转换。
private void bMPToolStripMenuItem_Click(object sender, EventArgs e)
{
Bitmap box = new Bitmap(pictureBox1.Image);
SaveFileDialog sv1 = new SaveFileDialog();
sv1.Filter = "bmp|*.bmp";
sv1.ShowDialog();
string str = sv1.FileName;
box.Save(str, System.Drawing.Imaging.ImageFormat.Bmp);
}
private void jPEGToolStripMenuItem_Click(object sender, EventArgs e)
{
Bitmap box = new Bitmap(pictureBox1.Image);
SaveFileDialog sv1 = new SaveFileDialog();
sv1.Filter = "jpeg文件|*.jpeg";
sv1.ShowDialog();
string str = sv1.FileName;
box.Save(str, System.Drawing.Imaging.ImageFormat.Jpeg);
}
（3）在窗体中添加两个PictureBox，然后利用OpenFileDialog控件选择一彩色图像文件并在pictureBox1中加载，然后将这一彩色图像转换为灰度图像，并在pictureBox2中进行显示，将此图像保存为a.bmp。
private void 灰度ToolStripMenuItem_Click(object sender, EventArgs e)
{
pictureBox2.SizeMode = PictureBoxSizeMode.StretchImage;
Color c = new Color();
Bitmap b1 = new Bitmap(pictureBox1.Image);
int rr, gg, bb, cc;
for (int i = 0; i < pictureBox1.Image.Width; i++)
{
for (int j = 0; j < pictureBox1.Image.Height; j++)
{
c = b1.GetPixel(i, j);
rr = c.R;
gg = c.G;
bb = c.B;
cc = (int)((rr + gg + bb) / 3);
if (cc < 0) cc = 0;
if (cc > 255) cc = 255;
Color nc = Color.FromArgb(cc, cc, cc);
b1.SetPixel(i, j, nc);
}
}
pictureBox2.Refresh();
pictureBox2.Image = b1;
}
private void 灰度图像存储ToolStripMenuItem_Click(object sender, EventArgs e)
{
if (pictureBox2.Image != null)
{
Bitmap box = new Bitmap(pictureBox2.Image);
SaveFileDialog sv1 = new SaveFileDialog();
sv1.Filter = "bmp文件|*.bmp";
sv1.ShowDialog();
string str = sv1.FileName;
box.Save(str, System.Drawing.Imaging.ImageFormat.Bmp);
//pictureBox2.SizeMode = PictureBoxSizeMode.StretchImage;
}
else MessageBox.Show("没有生成灰度图像");
}
