代碼實例一
代碼如下：
using System;
using System.IO;
using System.Collections;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
namespace Imag_writer
{
/// <summary>
/// 水印的類型
/// </summary>
public enum WaterMarkType
{
/// <summary>
/// 文字水印
/// </summary>
TextMark,
/// <summary>
/// 圖片水印
/// </summary>
//ImageMark // 暫時只能添加文字水印
};
/// <summary>
/// 水印的位置
/// </summary>
public enum WaterMarkPosition
{
/// <summary>
/// 左上角
/// </summary>
WMP_Left_Top,
/// <summary>
/// 左下角
/// </summary>
WMP_Left_Bottom,
/// <summary>
/// 右上角
/// </summary>
WMP_Right_Top,
/// <summary>
/// 右下角
/// </summary>
WMP_Right_Bottom
};
/// <summary>
/// 處理圖片的類（包括加水印，生成縮略圖）
/// </summary>
public class ImageWaterMark
{
public ImageWaterMark()
{
//
// TODO: 在此處添加構造函數邏輯
//
}
#region 給圖片加水印
/// <summary>
/// 添加水印(分圖片水印與文字水印兩種)
/// </summary>
/// <param name="oldpath">原圖片絕對地址</param>
/// <param name="newpath">新圖片放置的絕對地址</param>
/// <param name="wmtType">要添加的水印的類型</param>
/// <param name="sWaterMarkContent">水印內容，若添加文字水印，此即為要添加的文字；
/// 若要添加圖片水印，此為圖片的路徑</param>
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);
}
}
}
/// <summary>
/// 加水印文字
/// </summary>
/// <param name="picture">imge 對象</param>
/// <param name="_watermarkText">水印文字內容</param>
/// <param name="_watermarkPosition">水印位置</param>
/// <param name="_width">被加水印圖片的寬</param>
/// <param name="_height">被加水印圖片的高</param>
private void addWatermarkText(Graphics picture, string _watermarkText,
string _watermarkPosition, int _width, int _height)
{
// 確定水印文字的字體大小
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;
}
}
// 生成水印圖片（將文字寫到圖片中）
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);
// 畫陰影文字
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();
// 畫文字
fg.SmoothingMode=System.Drawing.Drawing2D.SmoothingMode.HighQuality;
fg.DrawString(_watermarkText,
crFont, new SolidBrush(Color.White),
pt.X, pt.Y, StringFormat.GenericDefault);
// 保存剛才的操作
fg.Save();
fg.Dispose();
// floatBmp.Save("d:\\WebSite\\DIGITALKM\\ttt.jpg");
// 將水印圖片加到原圖中
this.addWatermarkImage(
picture,
new Bitmap(floatBmp),
"WM_BOTTOM_RIGHT",
_width,
_height);
}
/// <summary>
/// 加水印圖片
/// </summary>
/// <param name="picture">imge 對象</param>
/// <param name="iTheImage">Image對象（以此圖片為水印）</param>
/// <param name="_watermarkPosition">水印位置</param>
/// <param name="_width">被加水印圖片的寬</param>
/// <param name="_height">被加水印圖片的高</param>
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;
//計算水印圖片的比率
//取背景的1/4寬度來比較
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();
}
/// <summary>
/// 加水印圖片
/// </summary>
/// <param name="picture">imge 對象</param>
/// <param name="WaterMarkPicPath">水印圖片的地址</param>
/// <param name="_watermarkPosition">水印位置</param>
/// <param name="_width">被加水印圖片的寬</param>
/// <param name="_height">被加水印圖片的高</param>
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 生成縮略圖
/// <summary>
/// 保存圖片
/// </summary>
/// <param name="image">Image 對象</param>
/// <param name="savePath">保存路徑</param>
/// <param name="ici">指定格式的編解碼參數</param>
private void SaveImage(Image image, string savePath, ImageCodecInfo ici)
{
//設置 原圖片 對象的 EncoderParameters 對象
EncoderParameters parameters = new EncoderParameters(1);
parameters.Param[0] = new EncoderParameter(
System.Drawing.Imaging.Encoder.Quality, ((long) 90));
image.Save(savePath, ici, parameters);
parameters.Dispose();
}
/// <summary>
/// 獲取圖像編碼解碼器的所有相關信息
/// </summary>
/// <param name="mimeType">包含編碼解碼器的多用途網際郵件擴充協議 (MIME) 類型的字符串</param>
/// <returns>返回圖像編碼解碼器的所有相關信息</returns>
private ImageCodecInfo GetCodecInfo(string mimeType)
{
ImageCodecInfo[] CodecInfo = ImageCodecInfo.GetImageEncoders();
foreach(ImageCodecInfo ici in CodecInfo)
{
if(ici.MimeType == mimeType)
return ici;
}
return null;
}
/// <summary>
/// 生成縮略圖
/// </summary>
/// <param name="sourceImagePath">原圖片路徑(相對路徑)</param>
/// <param name="thumbnailImagePath">生成的縮略圖路徑,如果為空則保存為原圖片路徑(相對路徑)</param>
/// <param name="thumbnailImageWidth">縮略圖的寬度（高度與按源圖片比例自動生成）</param>
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";
// 取得原圖片的後綴
string sExt = SourceImagePath.Substring(
SourceImagePath.LastIndexOf(".")).ToLower();
//從 原圖片創建 Image 對象
Image image = Image.FromFile(SourceImagePath);
int num = ((ThumbnailImageWidth / 4) * 3);
int width = image.Width;
int height = image.Height;
//計算圖片的比例
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 類的新實例
Bitmap bitmap = new Bitmap(ThumbnailImageWidth, num,
PixelFormat.Format32bppArgb);
//從指定的 Image 對象創建新 Graphics 對象
Graphics graphics = Graphics.FromImage(bitmap);
//清除整個繪圖面並以透明背景色填充
graphics.Clear(Color.Transparent);
graphics.SmoothingMode = SmoothingMode.HighQuality;
graphics.InterpolationMode = InterpolationMode.High;
//在指定位置並且按指定大小繪制 原圖片 對象
graphics.DrawImage(image, new Rectangle(0, 0, ThumbnailImageWidth, num));
image.Dispose();
try
{
//將此 原圖片 以指定格式並用指定的編解碼參數保存到指定文件
SaveImage(bitmap, ThumbnailImagePath,
GetCodecInfo((string)htmimes[sExt]));
}
catch(System.Exception e)
{
throw e;
}
}
#endregion
}
}
代碼實例二
代碼如下：
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();
}
/// <summary>
/// 從數據庫中加載二進制圖片
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
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;
}
/// <summary>
/// 在原圖片基礎上加載文字水印
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void button2_Click(object sender, EventArgs e)
{
Graphics GImage = Graphics.FromImage(imgWeight);
addWatermarkText(GImage, "重量為60.00噸", "WM_BOTTOM_RIGHT", imgWeight.Width, imgWeight.Height);
pictureBox1.Image = imgWeight;
}
/// <summary>
/// 在原圖片基礎上加載圖片水印
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void button3_Click(object sender, EventArgs e)
{
Graphics GImage = Graphics.FromImage(imgWeight);
addWatermarkImage(GImage, @"C:\Documents and Settings\Administrator\桌面\Mark.png", "WM_TOP_LEFT", imgWeight.Width, imgWeight.Height);
pictureBox1.Image = imgWeight;
}
/// <summary>
/// 生成圖片縮略圖
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void button4_Click(object sender, EventArgs e)
{
GreateMiniImage(@"C:\Documents and Settings\Administrator\桌面\Source.jpg", @"C:\Documents and Settings\Administrator\桌面\Small.png", 100, 200);
}
/// <summary>
/// 加水印文字
/// </summary>
/// <param name="picture">imge 對象</param>
/// <param name="_watermarkText">水印文字內容</param>
/// <param name="_watermarkPosition">水印位置</param>
/// <param name="_width">被加水印圖片的寬</param>
/// <param name="_height">被加水印圖片的高</param>
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();
}
/// <summary>
/// 加水印圖片
/// </summary>
/// <param name="picture">imge 對象</param>
/// <param name="WaterMarkPicPath">水印圖片的地址</param>
/// <param name="_watermarkPosition">水印位置</param>
/// <param name="_width">被加水印圖片的寬</param>
/// <param name="_height">被加水印圖片的高</param>
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;
//計算水印圖片的比率
//取背景的1/4寬度來比較
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();
}
/// <summary>
/// 生成縮略圖
/// </summary>
/// <param name="oldpath">原圖片地址</param>
/// <param name="newpath">新圖片地址</param>
/// <param name="tWidth">縮略圖的寬</param>
/// <param name="tHeight">縮略圖的高</param>
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 <= image.Height) && (tWidth >= 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.Height) && (tWidth <= tHeight))
{
if (image.Height / tHeight >= image.Width / tWidth)
{
bl = Convert.ToDouble(image.Width) / Convert.ToDouble(tWidth);
}
else
{
bl = Convert.ToDouble(image.Height) / Convert.ToDouble(tHeight);
}
}
else
{
if (image.Height / tHeight >= 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
{
}
}
}
}
