C#给图片添加水印完整实例
本文实例讲述了C#给图片添加水印的方法。分享给大家供大家参考，具体如下：
usingSystem;
usingSystem.Data;
usingSystem.Configuration;
usingSystem.Web;
usingSystem.Web.Security;
usingSystem.Web.UI;
usingSystem.Web.UI.WebControls;
usingSystem.Web.UI.WebControls.WebParts;
usingSystem.Web.UI.HtmlControls;
usingSystem.Drawing;
usingSystem.IO;
usingSystem.Drawing.Imaging;
///<summary>
///ImgWater的摘要说明
///</summary>
publicclassImgWater
{
publicImgWater()
{
//
//TODO:在此处添加构造函数逻辑
//
}
///<summary>
///图片水印
///</summary>
///<paramname="ImgFile">原图文件地址</param>
///<paramname="WaterImg">水印图片地址</param>
///<paramname="sImgPath">水印图片保存地址</param>
///<paramname="Alpha">水印透明度设置</param>
///<paramname="iScale">水印图片在原图上的显示比例</param>
///<paramname="intDistance">水印图片在原图上的边距确定,以图片的右边和下边为准,当设定的边距超过一定大小后参数会自动失效</param>
publicboolzzsImgWater(
stringImgFile
,stringWaterImg
,stringsImgPath
,floatAlpha
,floatiScale
,intintDistance
)
{
try
{
//装载图片
FileStreamfs=newFileStream(ImgFile,FileMode.Open);
BinaryReaderbr=newBinaryReader(fs);
byte[]bytes=br.ReadBytes((int)fs.Length);
br.Close();
fs.Close();
MemoryStreamms=newMemoryStream(bytes);
System.Drawing.ImageimgPhoto=System.Drawing.Image.FromStream(ms);
//System.Drawing.ImageimgPhoto=System.Drawing.Image.FromFile(ImgFile);
intimgPhotoWidth=imgPhoto.Width;
intimgPhotoHeight=imgPhoto.Height;
System.Drawing.ImageimgWatermark=newBitmap(WaterImg);
intimgWatermarkWidth=imgWatermark.Width;
intimgWatermarkHeight=imgWatermark.Height;
//计算水印图片尺寸
decimalaScale=Convert.ToDecimal(iScale);
decimalpScale=0.05M;
decimalMinScale=aScale-pScale;
decimalMaxScale=aScale+pScale;
intimgWatermarkWidthNew=imgWatermarkWidth;
intimgWatermarkHeightNew=imgWatermarkHeight;
if(imgPhotoWidth>=imgWatermarkWidth&&imgPhotoHeight>=imgWatermarkHeight&&imgPhotoWidth>=imgPhotoHeight)
if(imgWatermarkWidth>imgWatermarkHeight)
if((MinScale<=Math.Round((Convert.ToDecimal(imgWatermarkWidth)/Convert.ToDecimal(imgPhotoWidth)),7))&&(Math.Round((Convert.ToDecimal(imgWatermarkWidth)/Convert.ToDecimal(imgPhotoWidth)),7)<=MaxScale))
{
}
else
{
imgWatermarkWidthNew=Convert.ToInt32(imgPhotoWidth*aScale);
imgWatermarkHeightNew=Convert.ToInt32((imgPhotoWidth*aScale/imgWatermarkWidth)*imgWatermarkHeight);
}
else
if((MinScale<=Math.Round((Convert.ToDecimal(imgWatermarkHeight)/Convert.ToDecimal(imgPhotoHeight)),7))&&(Math.Round((Convert.ToDecimal(imgWatermarkHeight)/Convert.ToDecimal(imgPhotoHeight)),7)<=MaxScale))
{
}
else
{
imgWatermarkHeightNew=Convert.ToInt32(imgPhotoHeight*aScale);
imgWatermarkWidthNew=Convert.ToInt32((imgPhotoHeight*aScale/imgWatermarkHeight)*imgWatermarkWidth);
}
if(imgWatermarkWidth>=imgPhotoWidth&&imgWatermarkHeight>=imgPhotoHeight&&imgWatermarkWidth>=imgWatermarkHeight)
{
imgWatermarkWidthNew=Convert.ToInt32(imgPhotoWidth*aScale);
imgWatermarkHeightNew=Convert.ToInt32(((imgPhotoWidth*aScale)/imgWatermarkWidth)*imgWatermarkHeight);
}
if(imgWatermarkWidth>=imgPhotoWidth&&imgWatermarkHeight<=imgPhotoHeight&&imgPhotoWidth>=imgPhotoHeight)
{
imgWatermarkWidthNew=Convert.ToInt32(imgPhotoWidth*aScale);
imgWatermarkHeightNew=Convert.ToInt32(((imgPhotoWidth*aScale)/imgWatermarkWidth)*imgWatermarkHeight);
}
if(imgWatermarkWidth<=imgPhotoWidth&&imgWatermarkHeight>=imgPhotoHeight&&imgPhotoWidth>=imgPhotoHeight)
{
imgWatermarkHeightNew=Convert.ToInt32(imgPhotoHeight*aScale);
imgWatermarkWidthNew=Convert.ToInt32(((imgPhotoHeight*aScale)/imgWatermarkHeight)*imgWatermarkWidth);
}
if(imgPhotoWidth>=imgWatermarkWidth&&imgPhotoHeight>=imgWatermarkHeight&&imgPhotoWidth<=imgPhotoHeight)
if(imgWatermarkWidth>imgWatermarkHeight)
if((MinScale<=Math.Round((Convert.ToDecimal(imgWatermarkWidth)/Convert.ToDecimal(imgPhotoWidth)),7))&&(Math.Round((Convert.ToDecimal(imgWatermarkWidth)/Convert.ToDecimal(imgPhotoWidth)),7)<=MaxScale))
{
}
else
{
imgWatermarkWidthNew=Convert.ToInt32(imgPhotoWidth*aScale);
imgWatermarkHeightNew=Convert.ToInt32(((imgPhotoWidth*aScale)/imgWatermarkWidth)*imgWatermarkHeight);
}
else
if((MinScale<=Math.Round((Convert.ToDecimal(imgWatermarkHeight)/Convert.ToDecimal(imgPhotoHeight)),7))&&(Math.Round((Convert.ToDecimal(imgWatermarkHeight)/Convert.ToDecimal(imgPhotoHeight)),7)<=MaxScale))
{
}
else
{
imgWatermarkHeightNew=Convert.ToInt32(imgPhotoHeight*aScale);
imgWatermarkWidthNew=Convert.ToInt32(((imgPhotoHeight*aScale)/imgWatermarkHeight)*imgWatermarkWidth);
}
if(imgWatermarkWidth>=imgPhotoWidth&&imgWatermarkHeight>=imgPhotoHeight&&imgWatermarkWidth<=imgWatermarkHeight)
{
imgWatermarkHeightNew=Convert.ToInt32(imgPhotoHeight*aScale);
imgWatermarkWidthNew=Convert.ToInt32(((imgPhotoHeight*aScale)/imgWatermarkHeight)*imgWatermarkWidth);
}
if(imgWatermarkWidth>=imgPhotoWidth&&imgWatermarkHeight<=imgPhotoHeight&&imgPhotoWidth<=imgPhotoHeight)
{
imgWatermarkWidthNew=Convert.ToInt32(imgPhotoWidth*aScale);
imgWatermarkHeightNew=Convert.ToInt32(((imgPhotoWidth*aScale)/imgWatermarkWidth)*imgWatermarkHeight);
}
if(imgWatermarkWidth<=imgPhotoWidth&&imgWatermarkHeight>=imgPhotoHeight&&imgPhotoWidth<=imgPhotoHeight)
{
imgWatermarkHeightNew=Convert.ToInt32(imgPhotoHeight*aScale);
imgWatermarkWidthNew=Convert.ToInt32(((imgPhotoHeight*aScale)/imgWatermarkHeight)*imgWatermarkWidth);
}
//将原图画出来
BitmapbmPhoto=newBitmap(imgPhotoWidth,imgPhotoHeight,System.Drawing.Imaging.PixelFormat.Format24bppRgb);
bmPhoto.SetResolution(72,72);
GraphicsgbmPhoto=Graphics.FromImage(bmPhoto);
gbmPhoto.InterpolationMode=System.Drawing.Drawing2D.InterpolationMode.High;
gbmPhoto.SmoothingMode=System.Drawing.Drawing2D.SmoothingMode.HighQuality;
gbmPhoto.Clear(Color.White);
gbmPhoto.DrawImage(
imgPhoto
,newRectangle(0,0,imgPhotoWidth,imgPhotoHeight)
,0
,0
,imgPhotoWidth
,imgPhotoHeight
,GraphicsUnit.Pixel
);
BitmapbmWatermark=newBitmap(bmPhoto);
bmWatermark.SetResolution(imgPhoto.HorizontalResolution,imgPhoto.VerticalResolution);
GraphicsgWatermark=Graphics.FromImage(bmWatermark);
//指定高质量显示水印图片质量
gWatermark.InterpolationMode=System.Drawing.Drawing2D.InterpolationMode.High;
gWatermark.SmoothingMode=System.Drawing.Drawing2D.SmoothingMode.HighQuality;
ImageAttributesimageAttributes=newImageAttributes();
//设置两种颜色,达到合成效果
ColorMapcolorMap=newColorMap();
colorMap.OldColor=Color.FromArgb(255,0,255,0);
colorMap.NewColor=Color.FromArgb(0,0,0,0);
ColorMap[]remapTable={colorMap};
imageAttributes.SetRemapTable(remapTable,System.Drawing.Imaging.ColorAdjustType.Bitmap);
//用矩阵设置水印图片透明度
float[][]colorMatrixElements={
newfloat[]{1.0f,0.0f,0.0f,0.0f,0.0f},
newfloat[]{0.0f,1.0f,0.0f,0.0f,0.0f},
newfloat[]{0.0f,0.0f,1.0f,0.0f,0.0f},
newfloat[]{0.0f,0.0f,0.0f,Alpha,0.0f},
newfloat[]{0.0f,0.0f,0.0f,0.0f,1.0f}
};
System.Drawing.Imaging.ColorMatrixwmColorMatrix=newSystem.Drawing.Imaging.ColorMatrix(colorMatrixElements);
imageAttributes.SetColorMatrix(wmColorMatrix,System.Drawing.Imaging.ColorMatrixFlag.Default,System.Drawing.Imaging.ColorAdjustType.Bitmap);
//确定水印边距
intxPos=imgPhotoWidth-imgWatermarkWidthNew;
intyPos=imgPhotoHeight-imgWatermarkHeightNew;
intxPosOfWm=0;
intyPosOfWm=0;
if(xPos>intDistance)
xPosOfWm=xPos-intDistance;
else
xPosOfWm=xPos;
if(yPos>intDistance)
yPosOfWm=yPos-intDistance;
else
yPosOfWm=yPos;
gWatermark.DrawImage(
imgWatermark
,newRectangle(xPosOfWm,yPosOfWm,imgWatermarkWidthNew,imgWatermarkHeightNew)
,0
,0
,imgWatermarkWidth
,imgWatermarkHeight
,GraphicsUnit.Pixel
,imageAttributes
);
imgPhoto=bmWatermark;
//以jpg格式保存图片
imgPhoto.Save(sImgPath,System.Drawing.Imaging.ImageFormat.Jpeg);
//销毁对象
gbmPhoto.Dispose();
gWatermark.Dispose();
imgPhoto.Dispose();
imgWatermark.Dispose();
returntrue;
}
catch
{
returnfalse;
}
}
/**////<summary>
///文字水印
///</summary>
///<paramname="ImgFile">原图文件地址</param>
///<paramname="TextFont">水印文字</param>
///<paramname="sImgPath">文字水印图片保存地址</param>
///<paramname="hScale">高度位置</param>
///<paramname="widthFont">文字块在图片中所占宽度比例</param>
///<paramname="Alpha">文字透明度其数值的范围在0到255</param>
publicboolzzsTextWater(
stringImgFile
,stringTextFont
,stringsImgPath
,floathScale
,floatwidthFont
,intAlpha
)
{
try
{
FileStreamfs=newFileStream(ImgFile,FileMode.Open);
BinaryReaderbr=newBinaryReader(fs);
byte[]bytes=br.ReadBytes((int)fs.Length);
br.Close();
fs.Close();
MemoryStreamms=newMemoryStream(bytes);
System.Drawing.ImageimgPhoto=System.Drawing.Image.FromStream(ms);
//System.Drawing.ImageimgPhoto=System.Drawing.Image.FromFile(ImgFile);
intimgPhotoWidth=imgPhoto.Width;
intimgPhotoHeight=imgPhoto.Height;
BitmapbmPhoto=newBitmap(imgPhotoWidth,imgPhotoHeight,System.Drawing.Imaging.PixelFormat.Format24bppRgb);
bmPhoto.SetResolution(72,72);
GraphicsgbmPhoto=Graphics.FromImage(bmPhoto);
gbmPhoto.InterpolationMode=System.Drawing.Drawing2D.InterpolationMode.High;
gbmPhoto.SmoothingMode=System.Drawing.Drawing2D.SmoothingMode.HighQuality;
gbmPhoto.DrawImage(
imgPhoto
,newRectangle(0,0,imgPhotoWidth,imgPhotoHeight)
,0
,0
,imgPhotoWidth
,imgPhotoHeight
,GraphicsUnit.Pixel
);
//建立字体大小的数组,循环找出适合图片的水印字体
//int[]sizes=newint[]{1000,800,700,650,600,560,540,500,450,400,380,360,340,320,300,280,260,240,220,200,180,160,140,120,100,80,72,64,48,32,28,26,24,20,28,16,14,12,10,8,6,4,2};
int[]sizes=newint[]{28,26,24,20,16,14,12};
System.Drawing.FontcrFont=null;
System.Drawing.SizeFcrSize=newSizeF();
for(inti=0;i<7;i++)
{
crFont=newFont("微软雅黑",sizes[i],FontStyle.Bold);
crSize=gbmPhoto.MeasureString(TextFont,crFont);
if((ushort)crSize.Width<(ushort)imgPhotoWidth*widthFont)
break;
}
//设置水印字体的位置
//intyPixlesFromBottom=(int)(imgPhotoHeight*hScale);
//floatyPosFromBottom=((imgPhotoHeight-yPixlesFromBottom)-(crSize.Height/2));
//floatxCenterOfImg=(imgPhotoWidth*1/2);
floatyPosFromBottom=imgPhotoHeight*0.85f;
floatxCenterOfImg=imgPhotoWidth*0.8f;
//if(xCenterOfImg<crSize.Height)
//xCenterOfImg=(imgPhotoWidth*(1-(crSize.Height)/imgPhotoWidth));
System.Drawing.StringFormatStrFormat=newSystem.Drawing.StringFormat();
StrFormat.Alignment=System.Drawing.StringAlignment.Center;
//
System.Drawing.SolidBrushsemiTransBrush2=newSystem.Drawing.SolidBrush(Color.FromArgb(Alpha,0,0,0));
gbmPhoto.DrawString(
TextFont
,crFont
,semiTransBrush2
,newSystem.Drawing.PointF(xCenterOfImg+1,yPosFromBottom+1)
,StrFormat
);
System.Drawing.SolidBrushsemiTransBrush=newSystem.Drawing.SolidBrush(Color.FromArgb(Alpha,255,255,255));
//gbmPhoto.FillRectangle(semiTransBrush2,newRectangleF(newPointF(xCenterOfImg-crSize.Width/2,yPosFromBottom-4),crSize));
gbmPhoto.DrawString(
TextFont
,crFont
,semiTransBrush
,newSystem.Drawing.PointF(xCenterOfImg,yPosFromBottom)
,StrFormat
);
bmPhoto.Save(sImgPath,System.Drawing.Imaging.ImageFormat.Jpeg);
gbmPhoto.Dispose();
imgPhoto.Dispose();
bmPhoto.Dispose();
returntrue;
}
catch
{
returnfalse;
}
}
/**////<summary>
///文字和Logo图片水印
///</summary>
///<paramname="ImgFile">原图文件地址</param>
///<paramname="WaterImg">水印图片地址</param>
///<paramname="TextFont">水印文字信息</param>
///<paramname="sImgPath">生存水印图片后的保存地址</param>
///<paramname="ImgAlpha">水印图片的透明度</param>
///<paramname="imgiScale">水印图片在原图上的显示比例</param>
///<paramname="intimgDistance">水印图片在原图上的边距确定,以图片的右边和下边为准,当设定的边距超过一定大小后参数会自动失效</param>
///<paramname="texthScale">水印文字高度位置,从图片底部开始计算，0－1</param>
///<paramname="textwidthFont">文字块在图片中所占宽度比例0－1</param>
///<paramname="textAlpha">文字透明度其数值的范围在0到255</param>
publicvoidzzsImgTextWater(
stringImgFile
,stringWaterImg
,stringTextFont
,stringsImgPath
,floatImgAlpha
,floatimgiScale
,intintimgDistance
,floattexthScale
,floattextwidthFont
,inttextAlpha
)
{
try
{
FileStreamfs=newFileStream(ImgFile,FileMode.Open);
BinaryReaderbr=newBinaryReader(fs);
byte[]bytes=br.ReadBytes((int)fs.Length);
br.Close();
fs.Close();
MemoryStreamms=newMemoryStream(bytes);
System.Drawing.ImageimgPhoto=System.Drawing.Image.FromStream(ms);
//System.Drawing.ImageimgPhoto=System.Drawing.Image.FromFile(ImgFile);
intimgPhotoWidth=imgPhoto.Width;
intimgPhotoHeight=imgPhoto.Height;
BitmapbmPhoto=newBitmap(imgPhotoWidth,imgPhotoHeight,System.Drawing.Imaging.PixelFormat.Format24bppRgb);
bmPhoto.SetResolution(72,72);
GraphicsgbmPhoto=Graphics.FromImage(bmPhoto);
gbmPhoto.InterpolationMode=System.Drawing.Drawing2D.InterpolationMode.High;
gbmPhoto.SmoothingMode=System.Drawing.Drawing2D.SmoothingMode.HighQuality;
gbmPhoto.DrawImage(
imgPhoto
,newRectangle(0,0,imgPhotoWidth,imgPhotoHeight)
,0
,0
,imgPhotoWidth
,imgPhotoHeight
,GraphicsUnit.Pixel
);
//建立字体大小的数组,循环找出适合图片的水印字体
int[]sizes=newint[]{1000,800,700,650,600,560,540,500,450,400,380,360,340,320,300,280,260,240,220,200,180,160,140,120,100,80,72,64,48,32,28,26,24,20,28,16,14,12,10,8,6,4,2};
System.Drawing.FontcrFont=null;
System.Drawing.SizeFcrSize=newSizeF();
for(inti=0;i<43;i++)
{
crFont=newFont("arial",sizes[i],FontStyle.Bold);
crSize=gbmPhoto.MeasureString(TextFont,crFont);
if((ushort)crSize.Width<(ushort)imgPhotoWidth*textwidthFont)
break;
}
//设置水印字体的位置
intyPixlesFromBottom=(int)(imgPhotoHeight*texthScale);
floatyPosFromBottom=((imgPhotoHeight-yPixlesFromBottom)-(crSize.Height/2));
floatxCenterOfImg=(imgPhotoWidth*1/2);
System.Drawing.StringFormatStrFormat=newSystem.Drawing.StringFormat();
StrFormat.Alignment=System.Drawing.StringAlignment.Center;
//
System.Drawing.SolidBrushsemiTransBrush2=newSystem.Drawing.SolidBrush(Color.FromArgb(textAlpha,0,0,0));
gbmPhoto.DrawString(
TextFont
,crFont
,semiTransBrush2
,newSystem.Drawing.PointF(xCenterOfImg+1,yPosFromBottom+1)
,StrFormat
);
System.Drawing.SolidBrushsemiTransBrush=newSystem.Drawing.SolidBrush(Color.FromArgb(textAlpha,255,255,255));
gbmPhoto.DrawString(
TextFont
,crFont
,semiTransBrush
,newSystem.Drawing.PointF(xCenterOfImg,yPosFromBottom)
,StrFormat
);
System.Drawing.ImageimgWatermark=newBitmap(WaterImg);
intimgWatermarkWidth=imgWatermark.Width;
intimgWatermarkHeight=imgWatermark.Height;
//计算水印图片尺寸
decimalaScale=Convert.ToDecimal(imgiScale);
decimalpScale=0.05M;
decimalMinScale=aScale-pScale;
decimalMaxScale=aScale+pScale;
intimgWatermarkWidthNew=imgWatermarkWidth;
intimgWatermarkHeightNew=imgWatermarkHeight;
if(imgPhotoWidth>=imgWatermarkWidth&&imgPhotoHeight>=imgWatermarkHeight&&imgPhotoWidth>=imgPhotoHeight)
if(imgWatermarkWidth>imgWatermarkHeight)
if((MinScale<=Math.Round((Convert.ToDecimal(imgWatermarkWidth)/Convert.ToDecimal(imgPhotoWidth)),7))&&(Math.Round((Convert.ToDecimal(imgWatermarkWidth)/Convert.ToDecimal(imgPhotoWidth)),7)<=MaxScale))
{
}
else
{
imgWatermarkWidthNew=Convert.ToInt32(imgPhotoWidth*aScale);
imgWatermarkHeightNew=Convert.ToInt32((imgPhotoWidth*aScale/imgWatermarkWidth)*imgWatermarkHeight);
}
else
if((MinScale<=Math.Round((Convert.ToDecimal(imgWatermarkHeight)/Convert.ToDecimal(imgPhotoHeight)),7))&&(Math.Round((Convert.ToDecimal(imgWatermarkHeight)/Convert.ToDecimal(imgPhotoHeight)),7)<=MaxScale))
{
}
else
{
imgWatermarkHeightNew=Convert.ToInt32(imgPhotoHeight*aScale);
imgWatermarkWidthNew=Convert.ToInt32((imgPhotoHeight*aScale/imgWatermarkHeight)*imgWatermarkWidth);
}
if(imgWatermarkWidth>=imgPhotoWidth&&imgWatermarkHeight>=imgPhotoHeight&&imgWatermarkWidth>=imgWatermarkHeight)
{
imgWatermarkWidthNew=Convert.ToInt32(imgPhotoWidth*aScale);
imgWatermarkHeightNew=Convert.ToInt32(((imgPhotoWidth*aScale)/imgWatermarkWidth)*imgWatermarkHeight);
}
if(imgWatermarkWidth>=imgPhotoWidth&&imgWatermarkHeight<=imgPhotoHeight&&imgPhotoWidth>=imgPhotoHeight)
{
imgWatermarkWidthNew=Convert.ToInt32(imgPhotoWidth*aScale);
imgWatermarkHeightNew=Convert.ToInt32(((imgPhotoWidth*aScale)/imgWatermarkWidth)*imgWatermarkHeight);
}
if(imgWatermarkWidth<=imgPhotoWidth&&imgWatermarkHeight>=imgPhotoHeight&&imgPhotoWidth>=imgPhotoHeight)
{
imgWatermarkHeightNew=Convert.ToInt32(imgPhotoHeight*aScale);
imgWatermarkWidthNew=Convert.ToInt32(((imgPhotoHeight*aScale)/imgWatermarkHeight)*imgWatermarkWidth);
}
if(imgPhotoWidth>=imgWatermarkWidth&&imgPhotoHeight>=imgWatermarkHeight&&imgPhotoWidth<=imgPhotoHeight)
if(imgWatermarkWidth>imgWatermarkHeight)
if((MinScale<=Math.Round((Convert.ToDecimal(imgWatermarkWidth)/Convert.ToDecimal(imgPhotoWidth)),7))&&(Math.Round((Convert.ToDecimal(imgWatermarkWidth)/Convert.ToDecimal(imgPhotoWidth)),7)<=MaxScale))
{
}
else
{
imgWatermarkWidthNew=Convert.ToInt32(imgPhotoWidth*aScale);
imgWatermarkHeightNew=Convert.ToInt32(((imgPhotoWidth*aScale)/imgWatermarkWidth)*imgWatermarkHeight);
}
else
if((MinScale<=Math.Round((Convert.ToDecimal(imgWatermarkHeight)/Convert.ToDecimal(imgPhotoHeight)),7))&&(Math.Round((Convert.ToDecimal(imgWatermarkHeight)/Convert.ToDecimal(imgPhotoHeight)),7)<=MaxScale))
{
}
else
{
imgWatermarkHeightNew=Convert.ToInt32(imgPhotoHeight*aScale);
imgWatermarkWidthNew=Convert.ToInt32(((imgPhotoHeight*aScale)/imgWatermarkHeight)*imgWatermarkWidth);
}
if(imgWatermarkWidth>=imgPhotoWidth&&imgWatermarkHeight>=imgPhotoHeight&&imgWatermarkWidth<=imgWatermarkHeight)
{
imgWatermarkHeightNew=Convert.ToInt32(imgPhotoHeight*aScale);
imgWatermarkWidthNew=Convert.ToInt32(((imgPhotoHeight*aScale)/imgWatermarkHeight)*imgWatermarkWidth);
}
if(imgWatermarkWidth>=imgPhotoWidth&&imgWatermarkHeight<=imgPhotoHeight&&imgPhotoWidth<=imgPhotoHeight)
{
imgWatermarkWidthNew=Convert.ToInt32(imgPhotoWidth*aScale);
imgWatermarkHeightNew=Convert.ToInt32(((imgPhotoWidth*aScale)/imgWatermarkWidth)*imgWatermarkHeight);
}
if(imgWatermarkWidth<=imgPhotoWidth&&imgWatermarkHeight>=imgPhotoHeight&&imgPhotoWidth<=imgPhotoHeight)
{
imgWatermarkHeightNew=Convert.ToInt32(imgPhotoHeight*aScale);
imgWatermarkWidthNew=Convert.ToInt32(((imgPhotoHeight*aScale)/imgWatermarkHeight)*imgWatermarkWidth);
}
//将原图画出来
BitmapbmWatermark=newBitmap(bmPhoto);
bmWatermark.SetResolution(imgPhoto.HorizontalResolution,imgPhoto.VerticalResolution);
GraphicsgWatermark=Graphics.FromImage(bmWatermark);
//指定高质量显示水印图片质量
gWatermark.InterpolationMode=System.Drawing.Drawing2D.InterpolationMode.High;
gWatermark.SmoothingMode=System.Drawing.Drawing2D.SmoothingMode.HighQuality;
System.Drawing.Imaging.ImageAttributesimageAttributes=newSystem.Drawing.Imaging.ImageAttributes();
//设置两种颜色,达到合成效果
System.Drawing.Imaging.ColorMapcolorMap=newSystem.Drawing.Imaging.ColorMap();
colorMap.OldColor=Color.FromArgb(255,0,255,0);
colorMap.NewColor=Color.FromArgb(0,0,0,0);
System.Drawing.Imaging.ColorMap[]remapTable={colorMap};
imageAttributes.SetRemapTable(remapTable,System.Drawing.Imaging.ColorAdjustType.Bitmap);
//用矩阵设置水印图片透明度
float[][]colorMatrixElements={
newfloat[]{1.0f,0.0f,0.0f,0.0f,0.0f},
newfloat[]{0.0f,1.0f,0.0f,0.0f,0.0f},
newfloat[]{0.0f,0.0f,1.0f,0.0f,0.0f},
newfloat[]{0.0f,0.0f,0.0f,ImgAlpha,0.0f},
newfloat[]{0.0f,0.0f,0.0f,0.0f,1.0f}
};
System.Drawing.Imaging.ColorMatrixwmColorMatrix=newSystem.Drawing.Imaging.ColorMatrix(colorMatrixElements);
imageAttributes.SetColorMatrix(wmColorMatrix,System.Drawing.Imaging.ColorMatrixFlag.Default,System.Drawing.Imaging.ColorAdjustType.Bitmap);
//确定水印边距
intxPos=imgPhotoWidth-imgWatermarkWidthNew;
intyPos=imgPhotoHeight-imgWatermarkHeightNew;
intxPosOfWm=0;
intyPosOfWm=0;
if(xPos>intimgDistance)
xPosOfWm=xPos-intimgDistance;
else
xPosOfWm=xPos;
if(yPos>intimgDistance)
yPosOfWm=yPos-intimgDistance;
else
yPosOfWm=yPos;
gWatermark.DrawImage(
imgWatermark
,newRectangle(xPosOfWm,yPosOfWm,imgWatermarkWidthNew,imgWatermarkHeightNew)
,0
,0
,imgWatermarkWidth
,imgWatermarkHeight
,GraphicsUnit.Pixel
,imageAttributes
);
imgPhoto=bmWatermark;
//以jpg格式保存图片
imgPhoto.Save(sImgPath,System.Drawing.Imaging.ImageFormat.Jpeg);
//销毁对象
gbmPhoto.Dispose();
gWatermark.Dispose();
bmPhoto.Dispose();
imgPhoto.Dispose();
imgWatermark.Dispose();
}
catch
{
}
}
/**////<summary>
///缩略图
///</summary>
///<paramname="ImgFile">原图文件地址</param>
///<paramname="sImgPath">缩略图保存地址</param>
///<paramname="ResizeWidth">缩略图宽度</param>
///<paramname="ResizeHeight">缩略图高度</param>
///<paramname="BgColor">缩略图背景颜色,注意,背景颜色只能指定KnownColor中的值,如blue,red,green等</param>
publicboolzzsResizeImg(stringImgFile,stringsImgPath,intResizeWidth,intResizeHeight,stringBgColor)
{
try
{
FileStreamfs=newFileStream(ImgFile,FileMode.Open);
BinaryReaderbr=newBinaryReader(fs);
byte[]bytes=br.ReadBytes((int)fs.Length);
br.Close();
fs.Close();
MemoryStreamms=newMemoryStream(bytes);
System.Drawing.ImageimgPhoto=System.Drawing.Image.FromStream(ms);
//System.Drawing.ImageimgPhoto=System.Drawing.Image.FromFile(ImgFile);
intimgPhotoWidth=imgPhoto.Width;
intimgPhotoHeight=imgPhoto.Height;
intstartX=0;
intStartY=0;
intNewWidth=0;
intNewHeight=0;
if(imgPhotoWidth>=ResizeWidth&&imgPhotoHeight>=ResizeHeight)
{
NewWidth=ResizeWidth;
NewHeight=Convert.ToInt32(imgPhotoHeight*Math.Round(Convert.ToDecimal(ResizeWidth)/Convert.ToDecimal(imgPhotoWidth),10));
startX=0;
StartY=(ResizeHeight-NewHeight)/2;
}
if(ResizeWidth>imgPhotoWidth&&ResizeHeight<imgPhotoHeight)
{
NewHeight=ResizeHeight;
NewWidth=Convert.ToInt32(imgPhotoWidth*Math.Round(Convert.ToDecimal(ResizeHeight)/Convert.ToDecimal(imgPhotoHeight),10));
startX=(ResizeWidth-NewWidth)/2;
StartY=0;
}
if(ResizeWidth<imgPhotoWidth&&ResizeHeight>imgPhotoHeight)
{
NewWidth=ResizeWidth;
NewHeight=Convert.ToInt32(imgPhotoHeight*Math.Round(Convert.ToDecimal(ResizeWidth)/Convert.ToDecimal(imgPhotoWidth),10));
startX=0;
StartY=(ResizeHeight-NewHeight)/2;
}
if(imgPhotoWidth<ResizeWidth&&imgPhotoHeight<ResizeHeight)
{
NewWidth=imgPhotoWidth;
NewHeight=imgPhotoHeight;
startX=(ResizeWidth-imgPhotoWidth)/2;
StartY=(ResizeHeight-imgPhotoHeight)/2;
}
//计算缩放图片尺寸
BitmapbmPhoto=newBitmap(ResizeWidth,ResizeHeight,System.Drawing.Imaging.PixelFormat.Format24bppRgb);
bmPhoto.SetResolution(72,72);
GraphicsgbmPhoto=Graphics.FromImage(bmPhoto);
gbmPhoto.Clear(Color.FromName(BgColor));
gbmPhoto.InterpolationMode=System.Drawing.Drawing2D.InterpolationMode.High;
gbmPhoto.SmoothingMode=System.Drawing.Drawing2D.SmoothingMode.HighQuality;
gbmPhoto.DrawImage(
imgPhoto
,newRectangle(startX,StartY,NewWidth,NewHeight)
,newRectangle(0,0,imgPhotoWidth,imgPhotoHeight)
,GraphicsUnit.Pixel
);
bmPhoto.Save(sImgPath,System.Drawing.Imaging.ImageFormat.Jpeg);
imgPhoto.Dispose();
gbmPhoto.Dispose();
bmPhoto.Dispose();
ms.Close();
returntrue;
}
catch
{
returnfalse;
}
}
/**////<summary>
///图片剪切
///</summary>
///<paramname="ImgFile">原图文件地址</param>
///<paramname="sImgPath">缩略图保存地址</param>
///<paramname="PointX">剪切起始点X坐标</param>
///<paramname="PointY">剪切起始点Y坐标</param>
///<paramname="CutWidth">剪切宽度</param>
///<paramname="CutHeight">剪切高度</param>
publicboolzzsCutImg(stringImgFile,stringsImgPath,intPointX,intPointY,intCutWidth,intCutHeight)
{
FileStreamfs=newFileStream(ImgFile,FileMode.Open);
BinaryReaderbr=newBinaryReader(fs);
try
{
byte[]bytes=br.ReadBytes((int)fs.Length);
br.Close();
fs.Close();
MemoryStreamms=newMemoryStream(bytes);
System.Drawing.ImageimgPhoto=System.Drawing.Image.FromStream(ms);
//System.Drawing.ImageimgPhoto=System.Drawing.Image.FromFile(ImgFile);
//此处只能用filestream，用System.Drawing.Image则会报多过进程访问文件的错误，会锁定文件
BitmapbmPhoto=newBitmap(CutWidth,CutHeight,System.Drawing.Imaging.PixelFormat.Format24bppRgb);
bmPhoto.SetResolution(72,72);
GraphicsgbmPhoto=Graphics.FromImage(bmPhoto);
gbmPhoto.InterpolationMode=System.Drawing.Drawing2D.InterpolationMode.High;
gbmPhoto.SmoothingMode=System.Drawing.Drawing2D.SmoothingMode.HighQuality;
gbmPhoto.DrawImage(
imgPhoto
,newRectangle(0,0,CutWidth,CutHeight)
,newRectangle(PointX,PointY,CutHeight,CutHeight)
,GraphicsUnit.Pixel
);
bmPhoto.Save(sImgPath,System.Drawing.Imaging.ImageFormat.Jpeg);
imgPhoto.Dispose();
gbmPhoto.Dispose();
bmPhoto.Dispose();
ms.Close();
returntrue;
}
catch
{
returnfalse;
}
finally
{
}
}
}
希望本文所述对大家C#程序设计有所帮助。