代码段1
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System.Drawing.Image image =
System.Drawing.Image.FromFile(originalFilename);
System.Drawing.Size size = GetImageSize(image.Width, image.Height,
information.MaximumDimension);
System.Drawing.Image bitmap = new System.Drawing.Bitmap(size.Width,
size.Height);
System.Drawing.Graphics graphics =
System.Drawing.Graphics.FromImage(bitmap);
graphics.IntERPolationMode =
System.Drawing.Drawing2D.InterpolationMode.High;
graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
graphics.Clear(information.BackgroundColor);
graphics.DrawImage(image, new System.Drawing.Rectangle(0, 0, bitmap.Width,
bitmap.Height), new System.Drawing.Rectangle(0, 0, image.Width,
image.Height), System.Drawing.GraphicsUnit.Pixel);
graphics.Dispose();
代码段2
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//原始图片名称
string originalFilename = "c:\\222.jpg";
//生成的高质量图片名称
string strGoodFile = "c:\\222-small-good.jpg";
//生成的低质量图片名称
string strBadFile = "c:\\222-small-bad.jpg";
//缩小的倍数
int iScale = 3;
//从文件取得图片对象
System.Drawing.Image image = System.Drawing.Image.FromFile(originalFilename);
//取得图片大小
System.Drawing.Size size = new Size(image.Width / iScale , image.Height / iScale);
//新建一个bmp图片
System.Drawing.Image bitmap = new System.Drawing.Bitmap(size.Width,size.Height);
//新建一个画板
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap);
//设置高质量插值法
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
//设置高质量,低速度呈现平滑程度
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//清空一下画布
g.Clear(Color.Blue);
//在指定位置画图
g.DrawImage(image, new System.Drawing.Rectangle(0, 0, bitmap.Width, bitmap.Height),
new System.Drawing.Rectangle(0, 0, image.Width,image.Height),
System.Drawing.GraphicsUnit.Pixel);
//保存高清晰度的缩略图
bitmap.Save(strGoodFile, System.Drawing.Imaging.ImageFormat.Jpeg);
//取得原图像的普通缩略图
System.Drawing.Image img = image.GetThumbnailImage(image.Width / iScale, image.Height / iScale, null, IntPtr.Zero);
//保存普通缩略图
img.Save(strBadFile, System.Drawing.Imaging.ImageFormat.Jpeg);
g.Dispose();
MessageBox.Show("生成完毕");
俺自己写的一段原图+缩略图代码
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using System;
using System.Collections;
using System.ComponentModel;
using System.Configuration;
using System.Data;
using System.Drawing;
using System.Drawing.Imaging;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
namespace BSCRM.Shangpin
{
/// <summary>
/// Shangpin_IMG 的摘要说明。
/// </summary>
public class Shangpin_IMG : System.Web.UI.Page
{
string ImagePath = ConfigurationSettings.AppSettings["ImagePath"]+"\\";
bool error;
string src;
int height,width;
private void Page_Load(object sender, System.EventArgs e)
{
// 在此处放置用户代码以初始化页面
height=width=0;
if(Request["h"]!=null&&Request["h"].ToString().Trim()!="")
{
height=int.Parse(Request["h"].ToString().Trim());
}
if(Request["w"]!=null&&Request["h"].ToString().Trim()!="")
{
width=int.Parse(Request["w"].ToString().Trim());
}
if(Request["src"]!=null)
{
src = ImagePath+Request["src"].ToString();
try
{
System.Drawing.Image img = System.Drawing.Image.FromFile(src);
if(height>0||width>0)
{
if(height==0) height=img.Height;
if(width==0) width=img.Width;
System.Drawing.Image img2 = img.GetThumbnailImage(width,height,null,IntPtr.Zero);
img2.Save(Response.OutputStream,img.RawFormat);
img2.Dispose();
}
else
{
img.Save(Response.OutputStream,img.RawFormat);
}
img.Dispose();
}
catch
{
error = true;
}
}
else
{
error = true;
}
if(error)
{
Response.StatusCode = 404;
Response.Write("<html><head><title>Object Not Found</title></head><body><h1>HTTP/1.1 404 Object Not Found</h1></body></html>");
}
}
#region Web 窗体设计器生成的代码
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: 该调用是 ASP.net Web 窗体设计器所必需的。
//
InitializeComponent();
base.OnInit(e);
}
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.Load += new System.EventHandler(this.Page_Load);
}
#endregion
}
}