ContentType="Image/Jpeg"

%@ Page Language="C#" AutoEventWireup="true" CodeFile="TaiJiTu.aspx.cs" Inherits="TaiJiTu" ContentType="Image/Jpeg" %>
!DOCTYPE html> 
html xmlns="http://www.w3.org/1999/xhtml"> 
head runat="server"> 
meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> 
    title>/title> 
/head> 
body> 
    form id="form1" runat="server"> 
    div> 
    /div> 
    /form> 
/body> 
/html>

using System; 
using System.Drawing; 
using System.Drawing.Drawing2D; 
using System.Drawing.Imaging; 
 
public partial class TaiJiTu : System.Web.UI.Page 
{ 
    private Encoder myEncoder; 
    private EncoderParameter myEncoderParameter; 
    private EncoderParameters myEncoderParameters; 
    protected void Page_Load(object sender, EventArgs e) 
    { 
        int imgWidth = 400;                 //图象尺寸 
        int eyeRadius = imgWidth / 20;      //鱼眼半径 
        int headDiameter = imgWidth / 2;    //鱼头直径 
 
        Bitmap image = new Bitmap(imgWidth, imgWidth); 
        image.SetResolution(300, 300); 
 
        Graphics graphics = Graphics.FromImage(image); 
 
        //设置图像质量 
        graphics.CompositingQuality = CompositingQuality.HighQuality; 
        graphics.SmoothingMode = SmoothingMode.AntiAlias; 
        graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;

        //底色填充为白色 
        Brush white = new SolidBrush(Color.White); 
        graphics.FillRectangle(white, new Rectangle(0, 0, imgWidth, imgWidth));

        Brush blue = new SolidBrush(Color.Blue);//定义蓝色笔刷 
        Brush red = new SolidBrush(Color.Red);//定义红色笔刷 

        //整个圆形填充蓝色 
        graphics.FillPie(blue, 0, 0, imgWidth, imgWidth, 0, 360); 
 
        //定义右边的路径（红色部分） 
        GraphicsPath redPath = new GraphicsPath();//初始化路径 
        redPath.AddArc(0, 0, imgWidth, imgWidth, 0, -180); 
        redPath.AddArc(0, headDiameter / 2, headDiameter, headDiameter, 0, -180); 
        redPath.AddArc(headDiameter, headDiameter / 2, headDiameter, headDiameter, 0, 180);
        //填充右边部分 
        graphics.FillPath(red, redPath);
        //填充红色眼睛 
        graphics.FillPie(red, new Rectangle(headDiameter / 2 - eyeRadius, headDiameter - eyeRadius, eyeRadius * 2, eyeRadius * 2), 0, 360);
        //填充蓝色眼睛 
        graphics.FillPie(blue, new Rectangle(headDiameter + headDiameter / 2 - eyeRadius, headDiameter - eyeRadius, eyeRadius * 2, eyeRadius * 2), 0, 360); 

        graphics.Dispose(); 

        //写入到Response输出流中去，普通质量 
        //image.Save(Response.OutputStream, ImageFormat.Jpeg); 

        //修改图片保存质量 
        ImageCodecInfo myImageCodecInfo = GetEncoder(ImageFormat.Jpeg); 
        myEncoder = Encoder.Quality; 
        myEncoderParameters = new EncoderParameters(1); 
        //图片质量等级 
        myEncoderParameter = new EncoderParameter(myEncoder, 100L); 
        myEncoderParameters.Param[0] = myEncoderParameter; 
 
        //使用指定参数输出 
        image.Save(Response.OutputStream, myImageCodecInfo, myEncoderParameters); 
    } 
    private static ImageCodecInfo GetEncoder(ImageFormat format) 
    { 
        ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders(); 
 
        foreach (ImageCodecInfo codec in codecs) 
        { 
            if (codec.FormatID == format.Guid) 
            { 
                return codec; 
            } 
        } 
        return null; 
    } 
}