代码如下:
using System;
using System.IO;
using System.Collections;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
namespace Imag_writer
{
///
/// 水印的类型
///
public enum WaterMarkType
{
///
/// 文字水印
///
TextMark,
///
/// 图片水印
///
//ImageMark // 暂时只能添加文字水印
};
///
/// 水印的位置
///
public enum WaterMarkPosition
{
///
/// 左上角
///
WMP_Left_Top,
///
/// 左下角
///
WMP_Left_Bottom,
///
/// 右上角
///
WMP_Right_Top,
///
/// 右下角
///
WMP_Right_Bottom
};
///
/// 处理图片的类（包括加水印，生成缩略图）
///
public class ImageWaterMark
{
public ImageWaterMark()
{
//
// TODO: 在此处添加构造函数逻辑
//
}
#region 给图片加水印
///
/// 添加水印(分图片水印与文字水印两种)
///
/// 原图片绝对地址
/// 新图片放置的绝对地址
/// 要添加的水印的类型
/// 水印内容，若添加文字水印，此即为要添加的文字；
/// 若要添加图片水印，此为图片的路径
public void addWaterMark(string oldpath, string newpath,
WaterMarkType wmtType, string sWaterMarkContent)
{
try
{
Image image = Image.FromFile(oldpath);
Bitmap b = new Bitmap(image.Width, image.Height,
PixelFormat.Format24bppRgb);
Graphics g = Graphics.FromImage(b);
g.Clear(Color.White);
g.SmoothingMode = SmoothingMode.HighQuality;
g.InterpolationMode = InterpolationMode.High;
g.DrawImage(image, 0, 0, image.Width, image.Height);
switch (wmtType)
{
case WaterMarkType.TextMark:
//文字水印
this.addWatermarkText(g, sWaterMarkContent, "WM_BOTTOM_RIGHT",
image.Width, image.Height);
break;
}
b.Save(newpath);
b.Dispose();
image.Dispose();
}
catch
{
if(File.Exists(oldpath))
{
File.Delete(oldpath);
}
}
finally
{
if(File.Exists(oldpath))
{
File.Delete(oldpath);
}
}
}
///
/// 加水印文字
///
/// imge 对象
/// 水印文字内容
/// 水印位置
/// 被加水印图片的宽
/// 被加水印图片的高
private void addWatermarkText(Graphics picture, string _watermarkText,
string _watermarkPosition, int _width, int _height)
{
// 确定水印文字的字体大小
int[] sizes = new int[]{32, 30, 28, 26, 24, 22, 20, 18, 16, 14, 12, 10, 8, 6, 4};
Font crFont = null;
SizeF crSize = new SizeF();
for (int i = 0;i < sizes.Length; i++)
{
crFont = new Font("Arial Black", sizes[i], FontStyle.Bold);
crSize = picture.MeasureString(_watermarkText, crFont);
if((ushort)crSize.Width < (ushort)_width)
{
break;
}
}
// 生成水印图片（将文字写到图片中）
Bitmap floatBmp = new Bitmap((int)crSize.Width + 3,
(int)crSize.Height + 3, PixelFormat.Format32bppArgb);
Graphics fg=Graphics.FromImage(floatBmp);
PointF pt=new PointF(0,0);
// 画阴影文字
Brush TransparentBrush0 = new SolidBrush(Color.FromArgb(255, Color.Black));
Brush TransparentBrush1 = new SolidBrush(Color.FromArgb(255, Color.Black));
fg.DrawString(_watermarkText,crFont,TransparentBrush0, pt.X, pt.Y + 1);
fg.DrawString(_watermarkText,crFont,TransparentBrush0, pt.X + 1, pt.Y);
fg.DrawString(_watermarkText,crFont,TransparentBrush1, pt.X + 1, pt.Y + 1);
fg.DrawString(_watermarkText,crFont,TransparentBrush1, pt.X, pt.Y + 2);
fg.DrawString(_watermarkText,crFont,TransparentBrush1, pt.X + 2, pt.Y);
TransparentBrush0.Dispose();
TransparentBrush1.Dispose();
// 画文字
fg.SmoothingMode=System.Drawing.Drawing2D.SmoothingMode.HighQuality;
fg.DrawString(_watermarkText,
crFont, new SolidBrush(Color.White),
pt.X, pt.Y, StringFormat.GenericDefault);
// 保存刚才的操作
fg.Save();
fg.Dispose();
// floatBmp.Save("d:\WebSite\DIGITALKM\ttt.jpg");
// 将水印图片加到原图中
this.addWatermarkImage(
picture,
new Bitmap(floatBmp),
"WM_BOTTOM_RIGHT",
_width,
_height);
}
///
/// 加水印图片
///
/// imge 对象
/// Image对象（以此图片为水印）
/// 水印位置
/// 被加水印图片的宽
/// 被加水印图片的高
private void addWatermarkImage( Graphics picture,Image iTheImage,
string _watermarkPosition,int _width,int _height)
{
Image watermark = new Bitmap(iTheImage);
ImageAttributes imageAttributes = new ImageAttributes();
ColorMap colorMap = new ColorMap();
colorMap.OldColor = Color.FromArgb(255, 0, 255, 0);
colorMap.NewColor = Color.FromArgb(0, 0, 0, 0);
ColorMap[] remapTable = {colorMap};
imageAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap);
float[][] colorMatrixElements = {
new float[] {1.0f, 0.0f, 0.0f, 0.0f, 0.0f},
new float[] {0.0f, 1.0f, 0.0f, 0.0f, 0.0f},
new float[] {0.0f, 0.0f, 1.0f, 0.0f, 0.0f},
new float[] {0.0f, 0.0f, 0.0f, 0.3f, 0.0f},
new float[] {0.0f, 0.0f, 0.0f, 0.0f, 1.0f}
};
ColorMatrix colorMatrix = new ColorMatrix(colorMatrixElements);
imageAttributes.SetColorMatrix(colorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
int xpos = 0;
int ypos = 0;
int WatermarkWidth = 0;
int WatermarkHeight = 0;
double bl = 1d;
//计算水印图片的比率
//取背景的1/4宽度来比较
if ((_width > watermark.Width * 4) && (_height > watermark.Height * 4))
{
bl = 1;
}
else if ((_width > watermark.Width * 4) && (_height watermark.Height * 4))
{
bl = Convert.ToDouble(_width / 4) / Convert.ToDouble(watermark.Width);
}
else
{
if ((_width * watermark.Height) > (_height * watermark.Width))
{
bl = Convert.ToDouble(_height / 4) / Convert.ToDouble(watermark.Height);
}
else
{
bl = Convert.ToDouble(_width / 4) / Convert.ToDouble(watermark.Width);
}
}
WatermarkWidth = Convert.ToInt32(watermark.Width * bl);
WatermarkHeight = Convert.ToInt32(watermark.Height * bl);
switch (_watermarkPosition)
{
case "WM_TOP_LEFT":
xpos = 10;
ypos = 10;
break;
case "WM_TOP_RIGHT":
xpos = _width - WatermarkWidth - 10;
ypos = 10;
break;
case "WM_BOTTOM_RIGHT":
xpos = _width - WatermarkWidth - 10;
ypos = _height -WatermarkHeight - 10;
break;
case "WM_BOTTOM_LEFT":
xpos = 10;
ypos = _height - WatermarkHeight - 10;
break;
}
picture.DrawImage(
watermark,
new Rectangle(xpos, ypos, WatermarkWidth, WatermarkHeight),
0,
0,
watermark.Width,
watermark.Height,
GraphicsUnit.Pixel,
imageAttributes);
watermark.Dispose();
imageAttributes.Dispose();
}
///
/// 加水印图片
///
/// imge 对象
/// 水印图片的地址
/// 水印位置
/// 被加水印图片的宽
/// 被加水印图片的高
private void addWatermarkImage( Graphics picture,string WaterMarkPicPath,
string _watermarkPosition,int _width,int _height)
{
Image watermark = new Bitmap(WaterMarkPicPath);
this.addWatermarkImage(picture, watermark, _watermarkPosition, _width,
_height);
}
#endregion
#region 生成缩略图
///
/// 保存图片
///
/// Image 对象
/// 保存路径
/// 指定格式的编解码参数
private void SaveImage(Image image, string savePath, ImageCodecInfo ici)
{
//设置 原图片 对象的 EncoderParameters 对象
EncoderParameters parameters = new EncoderParameters(1);
parameters.Param[0] = new EncoderParameter(
System.Drawing.Imaging.Encoder.Quality, ((long) 90));
image.Save(savePath, ici, parameters);
parameters.Dispose();
}
///
/// 获取图像编码解码器的所有相关信息
///
/// 包含编码解码器的多用途网际邮件扩充协议 (MIME) 类型的字符串
/// 返回图像编码解码器的所有相关信息
private ImageCodecInfo GetCodecInfo(string mimeType)
{
ImageCodecInfo[] CodecInfo = ImageCodecInfo.GetImageEncoders();
foreach(ImageCodecInfo ici in CodecInfo)
{
if(ici.MimeType == mimeType)
return ici;
}
return null;
}
///
/// 生成缩略图
///
/// 原图片路径(相对路径)
/// 生成的缩略图路径,如果为空则保存为原图片路径(相对路径)
/// 缩略图的宽度（高度与按源图片比例自动生成）
public void ToThumbnailImages(
string SourceImagePath,
string ThumbnailImagePath,
int ThumbnailImageWidth)
{
Hashtable htmimes = new Hashtable();
htmimes[".jpeg"] = "image/jpeg";
htmimes[".jpg"] = "image/jpeg";
htmimes[".png"] = "image/png";
htmimes[".tif"] = "image/tiff";
htmimes[".tiff"] = "image/tiff";
htmimes[".bmp"] = "image/bmp";
htmimes[".gif"] = "image/gif";
// 取得原图片的后缀
string sExt = SourceImagePath.Substring(
SourceImagePath.LastIndexOf(".")).ToLower();
//从 原图片创建 Image 对象
Image image = Image.FromFile(SourceImagePath);
int num = ((ThumbnailImageWidth / 4) * 3);
int width = image.Width;
int height = image.Height;
//计算图片的比例
if ((((double) width) / ((double) height)) >= 1.3333333333333333f)
{
num = ((height * ThumbnailImageWidth) / width);
}
else
{
ThumbnailImageWidth = ((width * num) / height);
}
if ((ThumbnailImageWidth < 1) || (num < 1))
{
return;
}
//用指定的大小和格式初始化 Bitmap 类的新实例
Bitmap bitmap = new Bitmap(ThumbnailImageWidth, num,
PixelFormat.Format32bppArgb);
//从指定的 Image 对象创建新 Graphics 对象
Graphics graphics = Graphics.FromImage(bitmap);
//清除整个绘图面并以透明背景色填充
graphics.Clear(Color.Transparent);
graphics.SmoothingMode = SmoothingMode.HighQuality;
graphics.InterpolationMode = InterpolationMode.High;
//在指定位置并且按指定大小绘制 原图片 对象
graphics.DrawImage(image, new Rectangle(0, 0, ThumbnailImageWidth, num));
image.Dispose();
try
{
//将此 原图片 以指定格式并用指定的编解码参数保存到指定文件
SaveImage(bitmap, ThumbnailImagePath,
GetCodecInfo((string)htmimes[sExt]));
}
catch(System.Exception e)
{
throw e;
}
}
#endregion
}
}
代码实例二
代码如下:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Threading;
using System.Drawing.Imaging;
/* Author : IT
* Date: 2011-11-13 14:52:53
* Blog: www.chenpan.name
*/
namespace WaterImage
{
public partial class Form2 : Form
{
Image imgWeight;
public Form2()
{
InitializeComponent();
}
///
/// 从数据库中加载二进制图片
///
///
///
private void button1_Click(object sender, EventArgs e)
{
string strSql = "Select Top 1 FileContent From Sys_FileSave";
Byte[] byteImage = new Byte[0];
byteImage = (Byte[])(DbHelperSQL.GetSingle(strSql));
MemoryStream stmBLOBData = new MemoryStream(byteImage);
imgWeight = Image.FromStream(stmBLOBData); pictureBox1.Image = imgWeight;
}
///
/// 在原图片基础上加载文字水印
///
///
///
private void button2_Click(object sender, EventArgs e)
{
Graphics GImage = Graphics.FromImage(imgWeight);
addWatermarkText(GImage, "重量为60.00吨", "WM_BOTTOM_RIGHT", imgWeight.Width, imgWeight.Height);
pictureBox1.Image = imgWeight;
}
///
/// 在原图片基础上加载图片水印
///
///
///
private void button3_Click(object sender, EventArgs e)
{
Graphics GImage = Graphics.FromImage(imgWeight);
addWatermarkImage(GImage, @"C:Documents and SettingsAdministrator桌面Mark.png", "WM_TOP_LEFT", imgWeight.Width, imgWeight.Height);
pictureBox1.Image = imgWeight;
}
///
/// 生成图片缩略图
///
///
///
private void button4_Click(object sender, EventArgs e)
{
GreateMiniImage(@"C:Documents and SettingsAdministrator桌面Source.jpg", @"C:Documents and SettingsAdministrator桌面Small.png", 100, 200);
}
///
/// 加水印文字
///
/// imge 对象
/// 水印文字内容
/// 水印位置
/// 被加水印图片的宽
/// 被加水印图片的高
private void addWatermarkText(Graphics picture, string _watermarkText, string _watermarkPosition, int _width, int _height)
{
int[] sizes = new int[] { 16, 14, 12, 10, 8, 6, 4 };
Font crFont = null;
SizeF crSize = new SizeF();
for (int i = 0; i < 7; i++)
{
crFont = new Font("arial", sizes[i], FontStyle.Bold);
crSize = picture.MeasureString(_watermarkText, crFont);
if ((ushort)crSize.Width < (ushort)_width)
break;
}
float xpos = 0;
float ypos = 0;
switch (_watermarkPosition)
{
case "WM_TOP_LEFT":
xpos = ((float)_width * (float).01) + (crSize.Width / 2);
ypos = (float)_height * (float).01;
break;
case "WM_TOP_RIGHT":
xpos = ((float)_width * (float).99) - (crSize.Width / 2);
ypos = (float)_height * (float).01;
break;
case "WM_BOTTOM_RIGHT":
xpos = ((float)_width * (float).99) - (crSize.Width / 2);
ypos = ((float)_height * (float).99) - crSize.Height;
break;
case "WM_BOTTOM_LEFT":
xpos = ((float)_width * (float).01) + (crSize.Width / 2);
ypos = ((float)_height * (float).99) - crSize.Height;
break;
}
StringFormat StrFormat = new StringFormat();
StrFormat.Alignment = StringAlignment.Center;
SolidBrush semiTransBrush2 = new SolidBrush(Color.FromArgb(153, 0, 0, 0));
picture.DrawString(_watermarkText, crFont, semiTransBrush2, xpos + 1, ypos + 1, StrFormat);
SolidBrush semiTransBrush = new SolidBrush(Color.FromArgb(153, 255, 255, 255));
picture.DrawString(_watermarkText, crFont, semiTransBrush, xpos, ypos, StrFormat);
semiTransBrush2.Dispose();
semiTransBrush.Dispose();
}
///
/// 加水印图片
///
/// imge 对象
/// 水印图片的地址
/// 水印位置
/// 被加水印图片的宽
/// 被加水印图片的高
private void addWatermarkImage(Graphics picture, string WaterMarkPicPath, string _watermarkPosition, int _width, int _height)
{
Image watermark = new Bitmap(WaterMarkPicPath);
ImageAttributes imageAttributes = new ImageAttributes();
ColorMap colorMap = new ColorMap();
colorMap.OldColor = Color.FromArgb(255, 0, 255, 0);
colorMap.NewColor = Color.FromArgb(0, 0, 0, 0);
ColorMap[] remapTable = { colorMap };
imageAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap);
float[][] colorMatrixElements = {
new float[] {1.0f, 0.0f, 0.0f, 0.0f, 0.0f},
new float[] {0.0f, 1.0f, 0.0f, 0.0f, 0.0f},
new float[] {0.0f, 0.0f, 1.0f, 0.0f, 0.0f},
new float[] {0.0f, 0.0f, 0.0f, 0.3f, 0.0f},
new float[] {0.0f, 0.0f, 0.0f, 0.0f, 1.0f}
};
ColorMatrix colorMatrix = new ColorMatrix(colorMatrixElements);
imageAttributes.SetColorMatrix(colorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
int xpos = 0;
int ypos = 0;
int WatermarkWidth = 0;
int WatermarkHeight = 0;
double bl = 1d;
//计算水印图片的比率
//取背景的1/4宽度来比较
if ((_width > watermark.Width * 4) && (_height > watermark.Height * 4))
{
bl = 1;
}
else if ((_width > watermark.Width * 4) && (_height < watermark.Height * 4))
{
bl = Convert.ToDouble(_height / 4) / Convert.ToDouble(watermark.Height);
}
else
if ((_width < watermark.Width * 4) && (_height > watermark.Height * 4))
{
bl = Convert.ToDouble(_width / 4) / Convert.ToDouble(watermark.Width);
}
else
{
if ((_width * watermark.Height) > (_height * watermark.Width))
{
bl = Convert.ToDouble(_height / 4) / Convert.ToDouble(watermark.Height);
}
else
{
bl = Convert.ToDouble(_width / 4) / Convert.ToDouble(watermark.Width);
}
}
WatermarkWidth = Convert.ToInt32(watermark.Width * bl);
WatermarkHeight = Convert.ToInt32(watermark.Height * bl);
switch (_watermarkPosition)
{
case "WM_TOP_LEFT":
xpos = 10;
ypos = 10;
break;
case "WM_TOP_RIGHT":
xpos = _width - WatermarkWidth - 10;
ypos = 10;
break;
case "WM_BOTTOM_RIGHT":
xpos = _width - WatermarkWidth - 10;
ypos = _height - WatermarkHeight - 10;
break;
case "WM_BOTTOM_LEFT":
xpos = 10;
ypos = _height - WatermarkHeight - 10;
break;
}
picture.DrawImage(watermark, new Rectangle(xpos, ypos, WatermarkWidth, WatermarkHeight), 0, 0, watermark.Width, watermark.Height, GraphicsUnit.Pixel, imageAttributes);
watermark.Dispose();
imageAttributes.Dispose();
}
///
/// 生成缩略图
///
/// 原图片地址
/// 新图片地址
/// 缩略图的宽
/// 缩略图的高
private void GreateMiniImage(string oldpath, string newpath, int tWidth, int tHeight)
{
try
{
System.Drawing.Image image = System.Drawing.Image.FromFile(oldpath);
double bl = 1d;
if ((image.Width = tHeight))
{
bl = Convert.ToDouble(image.Height) / Convert.ToDouble(tHeight);
}
else if ((image.Width > image.Height) && (tWidth < tHeight))
{
bl = Convert.ToDouble(image.Width) / Convert.ToDouble(tWidth);
}
else
if ((image.Width = image.Width / tWidth)
{
bl = Convert.ToDouble(image.Height) / Convert.ToDouble(tHeight);
}
else
{
bl = Convert.ToDouble(image.Width) / Convert.ToDouble(tWidth);
}
}
Bitmap b = new Bitmap(image, Convert.ToInt32(image.Width / bl), Convert.ToInt32(image.Height / bl));
b.Save(newpath);
b.Dispose();
image.Dispose();
}
catch
{
}
}
}
}