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" );
}
（4）将（3）中制作的a.bmp图像加载到picturebox1，把a.bmp转换为二值图像，并在picturebox2中进行显示。
private void 转化toolstripmenuitem_click( object sender, eventargs e)
{
//bitmap m = new bitmap(picturebox1.width, picturebox1.height);
bitmap map= new bitmap(picturebox1.image);
color c;
for ( int i = 0; i < map.height; i++)
{
for ( int j = 0; j < map.width; j++)
{
c = map.getpixel(j, i);
if (c.r > 100) c = color.fromargb(255, 255, 255); //红色分量值大于100则设成白色
else c = color.black;
map.setpixel(j, i, c);
}
}
picturebox2.image = map;
picturebox2.sizemode = pictureboxsizemode.stretchimage;
}
（5）建立对比度增强算法，并对a.bmp图像进行对比度增强，显示在picturebox2中显示出来,与picturebox1中的a.bmp图像进行比较。
private void 对比toolstripmenuitem_click( object sender, eventargs e)
{
color c = new color();
bitmap box1 = new bitmap(picturebox1.image);
int lev=30, wid=170;
int [] map = new int [256];
for ( int i=0;i<=lev;i++)
{
map[i]=0;
}
for ( int i=lev;i<=wid;i++) //对比度增强
{
map[i] = ( int )((i * 1.0 - lev) / wid * 255);
}
for ( int i = lev + wid; i < 256; i++)
{
map[i] = 255;
}
int gray;
for ( int i = 0; i < box1.width; i++)
{
for ( int j = 0; j < box1.height; j++)
{
c = box1.getpixel(i, j);
gray = c.r;
c = color.fromargb(map[gray], map[gray], map[gray]);
box1.setpixel(i, j, c);
}
}
picturebox2.image = box1;
picturebox2.sizemode = pictureboxsizemode.stretchimage;
}
灰度图像：
二值图像:
对比度增强：
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/theArcticOcean/article/details/50172559
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