C# · 12月 25, 2021

c#图片添加水印的实例代码

复制代码 代码如下:
using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;
namespace ImageDrawing
{
/// <summary>
/// 图片修改类,主要是用来保护图片版权的
/// </summary>
public class ImageModification
{
#region “member fields”
private string modifyImagePath=null;
private string drawedImagePath=null;
private int rightSpace;
private int bottoamSpace;
private int lucencyPercent=70;
private string outPath=null;
#endregion
public ImageModification()
{
}
#region “propertys”
/// <summary>
/// 获取或设置要修改的图像路径
/// </summary>
public string ModifyImagePath
{
get{return this.modifyImagePath;}
set{this.modifyImagePath=value;}
}
/// <summary>
/// 获取或设置在画的图片路径(水印图片)
/// </summary>
public string DrawedImagePath
{
get{return this.drawedImagePath;}
set{this.drawedImagePath=value;}
}
/// <summary>
/// 获取或设置水印在修改图片中的右边距
/// </summary>
public int RightSpace
{
get{return this.rightSpace;}
set{this.rightSpace=value;}
}
//获取或设置水印在修改图片中距底部的高度
public int BottoamSpace
{
get{return this.bottoamSpace;}
set{this.bottoamSpace=value;}
}
/// <summary>
/// 获取或设置要绘制水印的透明度,注意是原来图片透明度的百分比
/// </summary>
public int LucencyPercent
{
get{return this.lucencyPercent;}
set
{
if(value>=0&&value<=100)
this.lucencyPercent=value;
}
}
/// <summary>
/// 获取或设置要输出图像的路径
/// </summary>
public string OutPath
{
get{return this.outPath;}
set{this.outPath=value;}
}
#endregion
#region “methods”
/// <summary>
/// 开始绘制水印
/// </summary>
public void DrawImage()
{
Image modifyImage=null;
Image drawedImage=null;
Graphics g=null;
try
{
//建立图形对象
modifyImage=Image.FromFile(this.ModifyImagePath);
drawedImage=Image.FromFile(this.DrawedImagePath);
g=Graphics.FromImage(modifyImage);
//获取要绘制图形坐标
int x=modifyImage.Width-this.rightSpace;
int y=modifyImage.Height-this.BottoamSpace;
//设置颜色矩阵
float[][] matrixItems ={
new float[] {1,0},
new float[] {0,1,(float)this.LucencyPercent/100f,1}};
ColorMatrix colorMatrix = new ColorMatrix(matrixItems);
ImageAttributes imgAttr=new ImageAttributes();
imgAttr.SetColorMatrix(colorMatrix,ColorMatrixFlag.Default,ColorAdjustType.Bitmap);
//绘制阴影图像
g.DrawImage(
drawedImage,
new Rectangle(x,y,drawedImage.Width,drawedImage.Height),
0,drawedImage.Height,
GraphicsUnit.Pixel,imgAttr);
//保存文件
string[] allowImageType={“.jpg”,”.gif”,”.png”,”.bmp”,”.tiff”,”.wmf”,”.ico”};
FileInfo file=new FileInfo(this.ModifyImagePath);
ImageFormat imageType=ImageFormat.Gif;
switch(file.Extension.ToLower())
{
case “.jpg”:
imageType=ImageFormat.Jpeg;
break;
case “.gif”:
imageType=ImageFormat.Gif;
break;
case “.png”:
imageType=ImageFormat.Png;
break;
case “.bmp”:
imageType=ImageFormat.Bmp;
break;
case “.tif”:
imageType=ImageFormat.Tiff;
break;
case “.wmf”:
imageType=ImageFormat.Wmf;
break;
case “.ico”:
imageType=ImageFormat.Icon;
break;
default:
break;
}
MemoryStream ms=new MemoryStream();
modifyImage.Save(ms,imageType);
byte[] imgData=ms.ToArray();
modifyImage.Dispose();
drawedImage.Dispose();
g.Dispose();
FileStream fs=null;
if(this.OutPath==null || this.OutPath==””)
{
File.Delete(this.ModifyImagePath);
fs=new FileStream(this.ModifyImagePath,FileMode.Create,FileAccess.Write);
}
else
{
fs=new FileStream(this.OutPath,FileAccess.Write);
}
if(fs!=null)
{
fs.Write(imgData,imgData.Length);
fs.Close();
}
}
finally
{
try
{
drawedImage.Dispose();
modifyImage.Dispose();
g.Dispose();
}
catch{;}
}
}
#endregion
}
}