C#给图片加水印文字或图片

/// <summary>
/// WaterMark 的摘要说明
/// </summary>
/// 图片加水印
/// <param name="strCopyright">要加入的文字 </param>
/// <param name="strMarkPath">水印图片路径 </param>
/// <param name="strPhotoPath">要加水印的图片路径 </param>
/// <param name="strSavePath">处理后的图片路径 </param>
/// <param name="iMarkRightSpace">水印在修改图片中距右边的宽度 </param>
/// <param name="iMarkButtomSpace">水印在修改图片中距底部的高度 </param>
/// <param name="iDiaphaneity">水印图片的透明度 </param>
/// <param name="iFontRightSpace">文字 </param>
/// <param name="iFontButtomSpace">文字 </param>
/// <param name="iFontDiaphaneity">文字 </param>
/// <param name="bShowCopyright">是否显示文字 </param>
/// <param name="bShowMarkImage">是否显示水印图片 </param>
public class WaterMark
{
#region param

private string strCopyright, strMarkPath, strPhotoPath, strSavePath;
private int iMarkRightSpace, iMarkButtomSpace, iDiaphaneity;
private int iFontRightSpace = 0, iFontButtomSpace = 0, iFontDiaphaneity = 80;
private int iFontSize = 10;
private bool bShowCopyright = true, bShowMarkImage = true;

#endregion

#region WaterMark

public WaterMark()
{
this.strCopyright = "";
this.strMarkPath = null;
this.strPhotoPath = null;
this.strSavePath = null;
this.iDiaphaneity = 70;
this.iMarkRightSpace = 0;
this.iMarkButtomSpace = 0;
}

/// <summary>
/// 主要用两样都加的
/// </summary>
public WaterMark(string copyright, string markPath, string photoPath, string savePath)
{
this.strCopyright = copyright;
this.strMarkPath = markPath;
this.strPhotoPath = photoPath;
this.strSavePath = savePath;
this.iDiaphaneity = 70;
this.iMarkRightSpace = 0;
this.iMarkButtomSpace = 0;
}

#endregion

#region property

/// <summary>
/// 设置是否显示水印文字
/// </summary>
public bool ShowCopyright
{
set { this.bShowCopyright = value; }
}

/// <summary>
/// 设置是否显示水印图片
/// </summary>
public bool ShowMarkImage
{
set { this.bShowMarkImage = value; }
}
/// <summary>
/// 获取或设置要加入的文字
/// </summary>
public string Copyright
{
set { this.strCopyright = value; }
}

/// <summary>
/// 获取或设置加水印后的图片路径
/// </summary>
public string SavePath
{
get { return this.strSavePath; }
set { this.strSavePath = value; }
}

/// <summary>
/// 获取或设置水印图片路径
/// </summary>
public string MarkPath
{
get { return this.strMarkPath; }
set { this.strMarkPath = value; }
}

/// <summary>
/// 获取或设置要加水印图片的路径
/// </summary>
public string PhotoPath
{
get { return this.strPhotoPath; }
set { this.strPhotoPath = value; }
}

/// <summary>
/// 设置水印图片的透明度
/// </summary>
public int Diaphaneity
{
set
{
if (value > 0 && value <= 100)
this.iDiaphaneity = value;
}
}

/// <summary>
/// 设置水印字体的透明度0-255
/// </summary>
public int FontDiaphaneity
{
set
{
if (value >= 0 && value <= 255)
this.iFontDiaphaneity = value;
}
}

/// <summary>
/// 设置水印图片在修改图片中距左边的高度
/// </summary>
public int MarkRightSpace
{
set { this.iMarkRightSpace = value; }
}

/// <summary>
/// 设置水印图片在修改图片中距底部的高度
/// </summary>
public int MarkButtomSpace
{
set { this.iMarkButtomSpace = value; }
}

/// <summary>
/// 设置水印字体在修改图片中距左边的距离
/// </summary>
public int FontRightSpace
{
set { iFontRightSpace = value; }
}

/// <summary>
/// 设置水印字体在修改图片中距底部的高度
/// </summary>
public int FontButtomSpace
{
set { iFontButtomSpace = value; }
}

#endregion

/// <summary>
/// 生成水印图片
/// </summary>
/// <returns> </returns>
public void createMarkPhoto()
{
Bitmap bmWatermark = null;
FileStream fileStream = new FileStream(this.strPhotoPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
Image gPhoto = Image.FromStream(fileStream);
int PhotoWidth = gPhoto.Width;
int PhotoHeight = gPhoto.Height;
//Bitmap bitPhoto = new Bitmap(PhotoWidth, PhotoHeight, PixelFormat.Format24bppRgb);
Bitmap bitPhoto = new Bitmap(PhotoWidth, PhotoHeight);
bitPhoto.SetResolution(gPhoto.HorizontalResolution, gPhoto.VerticalResolution);

try
{
if (bShowCopyright)
{
Graphics grPhoto = Graphics.FromImage(bitPhoto);
//grPhoto.SmoothingMode = SmoothingMode.AntiAlias;//这句代码的作用是让合成模式为自动反锯齿,也就是所谓的"模糊"
grPhoto.DrawImage(gPhoto, new Rectangle(0, 0, PhotoWidth, PhotoHeight), 0, 0, PhotoWidth, PhotoHeight, GraphicsUnit.Pixel);

Font crFont = new Font("楷体", iFontSize, FontStyle.Bold);
SizeF crSize = grPhoto.MeasureString(strCopyright, crFont);

//设置字体在图片中的位置
float yPosFromBottom = PhotoHeight - iFontButtomSpace - (crSize.Height);

//float xCenterOfImg = (phWidth/2);
float xCenterOfImg = PhotoWidth - iFontRightSpace - (crSize.Width / 2);
//设置字体居中

StringFormat StrFormat = new StringFormat();
StrFormat.Alignment = StringAlignment.Center;

//设置绘制文本的颜色和纹理 (Alpha=153)
SolidBrush semiTransBrush2 = new SolidBrush(Color.FromArgb(this.iFontDiaphaneity, 0, 0, 0));

//将版权信息绘制到图象上
grPhoto.DrawString(strCopyright, crFont, semiTransBrush2, new PointF(xCenterOfImg, yPosFromBottom), StrFormat);

gPhoto = bitPhoto;
grPhoto.Dispose();
}

if (bShowMarkImage)
{
//创建一个需要填充水银的Image对象
Image imgWatermark = new Bitmap(strMarkPath);
int iMarkWidth = imgWatermark.Width;
int iMarkmHeight = imgWatermark.Height;

Graphics grWatermark = null;
if (bShowCopyright)
{
//在原来修改过的bmPhoto上创建一个水银位图
bmWatermark = new Bitmap(bitPhoto);
bmWatermark.SetResolution(gPhoto.HorizontalResolution, gPhoto.VerticalResolution);
}
else
{
bmWatermark = new Bitmap(gPhoto);
}

//将位图bmWatermark加载到Graphics对象
grWatermark = Graphics.FromImage(bmWatermark);
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, (float)iDiaphaneity/100f, 0.0f},
new float[] {0.0f, 0.0f, 0.0f, 0.0f, 1.0f}};
ColorMatrix wmColorMatrix = new ColorMatrix(colorMatrixElements);
imageAttributes.SetColorMatrix(wmColorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
grWatermark.DrawImage(imgWatermark, new Rectangle((PhotoWidth - iMarkRightSpace - (iMarkWidth / 2)), (PhotoHeight - iMarkButtomSpace - (iMarkmHeight / 2)), iMarkWidth, iMarkmHeight), 0, 0, iMarkWidth, iMarkmHeight, GraphicsUnit.Pixel, imageAttributes);

gPhoto = bmWatermark;
grWatermark.Dispose();
imgWatermark.Dispose();
}
//设置输出图片质量，默认输出是60%的清晰度
EncoderParameter ep = new EncoderParameter(Encoder.Quality, 100L);
EncoderParameters eps = new EncoderParameters(1);
eps.Param[0] = ep;
ImageCodecInfo ic = GetCodecInfo("image/jpeg");
fileStream.Close();
gPhoto.Save(strSavePath, ic, eps);
bmWatermark.Dispose();
bitPhoto.Dispose();
gPhoto.Dispose();
ep.Dispose();
eps.Dispose();
}
finally
{
if (bitPhoto != null)
bitPhoto.Dispose();
if (bmWatermark != null)
bmWatermark.Dispose();
fileStream.Close();
gPhoto.Dispose();
}
}

private ImageCodecInfo GetCodecInfo(String mimeType)
{
ImageCodecInfo[] CodecInfo = ImageCodecInfo.GetImageEncoders();
foreach (ImageCodecInfo ici in CodecInfo)
{
if (ici.MimeType == mimeType) return ici;
}
return null;
}
}

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