1、水印时，在图片右下角水印网站logo
PicMark wm = new PicMark();
wm.DrawedImagePath = HttpContext.Current.Server.MapPath("..\\Images\\") + "logo.jpg"; //需要水印添加的图片
wm.ModifyImagePath = newpath; //原始路径
wm.LucencyPercent = 20; //透明度 1-100之间
wm.OutPath = newpath; //输出路径
wm.DrawImage(); //对图片进行水印处理：添加到图片右下角
2、水印时，在图片右下角水印一段文字或网站网址
PicMark wm = new PicMark();
wm.DrawedWord = "郑德才"; //需要水印添加的文字
wm.ModifyImagePath = newpath; //原始路径
wm.LGray = 0.5; //灰度 0-1之间
wm.OutPath = newpath; //输出路径
wm.DrawWords(); //对水印文字处理：添加到图片右下角
PicMark实例类代码：
using System;
using System.Collections.Generic;
using System.Web;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Drawing.Drawing2D;
/// <summary>
///PicMark 的摘要说明、图片水印logo
/// </summary>
public class PicMark
{
public PicMark()
{
//
//TODO: 在此处添加构造函数逻辑
//
}
#region "member fields"
private string modifyImagePath = null;
private string drawedWord = null;
private string drawedImagePath = null;
private int rightSpace;
private int bottoamSpace;
private int lucencyPercent = 70;
private double lGray = 0.5;
private string outPath = null;
#endregion
#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>
/// 获取或设置在画的水印文字
/// </summary>
public string DrawedWord
{
get { return this.drawedWord; }
set { this.drawedWord = 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 double LGray
{
get { return this.lGray; }
set { this.lGray = 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 - (drawedImage.Width + 5);
int y = modifyImage.Height - (drawedImage.Height + 5);
//设置颜色矩阵
float[][] matrixItems ={
new float[] {1, 0, 0, 0, 0},
new float[] {0, 1, 0, 0, 0},
new float[] {0, 0, 1, 0, 0},
new float[] {0, 0, 0, (float)this.LucencyPercent/100f, 0},
new float[] {0, 0, 0, 0, 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, 0, drawedImage.Width, 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, FileMode.Create, FileAccess.Write);
}
if (fs != null)
{
fs.Write(imgData, 0, imgData.Length);
fs.Close();
}
}
finally
{
try
{
drawedImage.Dispose();
modifyImage.Dispose();
g.Dispose();
}
catch { ;}
}
}
/// <summary>
/// 在图片上添加水印文字
/// </summary>
/// <param name="sourcePicture">源图片文件</param>
/// <param name="waterWords">需要添加到图片上的文字</param>
/// <param name="alpha">透明度</param>
/// <param name="position">位置</param>
/// <param name="PicturePath">文件路径</param>
/// <returns></returns>
public void DrawWords()
{
Image modifyImage = null;
Graphics grPhoto = null;
try
{
//建立图形对象
modifyImage = Image.FromFile(this.ModifyImagePath);
grPhoto = Graphics.FromImage(modifyImage);
//获取图片的宽和高
int phWidth = modifyImage.Width;
int phHeight = modifyImage.Height;
//设置图形的品质
grPhoto.SmoothingMode = SmoothingMode.AntiAlias;
//将我们要添加水印的图片按照原始大小描绘（复制）到图形中
grPhoto.DrawImage(
modifyImage, // 要添加水印的图片
new Rectangle(0, 0, phWidth, phHeight), // 根据要添加的水印图片的宽和高
0, // X方向从0点开始描绘
0, // Y方向
phWidth, // X方向描绘长度
phHeight, // Y方向描绘长度
GraphicsUnit.Pixel); // 描绘的单位，这里用的是像素
//根据图片的大小我们来确定添加上去的文字的大小
//在这里我们定义一个数组来确定
int[] sizes = new int[] { 16, 14, 12, 10, 8, 6, 4 };
//字体
Font crFont = null;
//矩形的宽度和高度，SizeF有三个属性，分别为Height高，width宽，IsEmpty是否为空
SizeF crSize = new SizeF();
//利用一个循环语句来选择我们要添加文字的型号
//直到它的长度比图片的宽度小
for (int i = 0; i < 7; i++)
{
crFont = new Font("arial", sizes[i], FontStyle.Bold);
//测量用指定的 Font 对象绘制并用指定的 StringFormat 对象格式化的指定字符串。
crSize = grPhoto.MeasureString(this.DrawedWord.Trim(), crFont);
// ushort 关键字表示一种整数数据类型
if ((ushort)crSize.Width < (ushort)phWidth)
break;
}
int x = phWidth - (Convert.ToInt32(crSize.Width) - Convert.ToInt32(crSize.Width) / 2 + 5); //文字长度的中间位置
int y = phHeight - (Convert.ToInt32(crSize.Height) + 5);
//封装文本布局信息（如对齐、文字方向和 Tab 停靠位），显示操作（如省略号插入和国家标准 (National) 数字替换）和 OpenType 功能。
StringFormat StrFormat = new StringFormat();
//定义需要印的文字居中对齐
StrFormat.Alignment = StringAlignment.Center;
//SolidBrush:定义单色画笔。画笔用于填充图形形状，如矩形、椭圆、扇形、多边形和封闭路径。
//这个画笔为描绘阴影的画笔，呈灰色
int m_alpha = Convert.ToInt32(256 * this.LGray);
SolidBrush semiTransBrush2 = new SolidBrush(Color.FromArgb(m_alpha, 0, 0, 0));
//描绘文字信息，这个图层向右和向下偏移一个像素，表示阴影效果
//DrawString 在指定矩形并且用指定的 Brush 和 Font 对象绘制指定的文本字符串。
grPhoto.DrawString(this.DrawedWord.Trim(), //string of text
crFont, //font
semiTransBrush2, //Brush
new Point(x, y), //Position
StrFormat);
//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();
grPhoto.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, FileMode.Create, FileAccess.Write);
}
if (fs != null)
{
fs.Write(imgData, 0, imgData.Length);
fs.Close();
}
}
finally
{
try
{
modifyImage.Dispose();
grPhoto.Dispose();
}
catch { ;}
}
}
#endregion
}
效果图片：
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