C设置图像透明度.doc
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float[][] nArray ={ 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, opacity, 0},
new float[] {0, 0, 0, 0, 1}};
ColorMatrix matrix = new ColorMatrix(nArray);
ImageAttributes attributes = new ImageAttributes();
attributes.SetColorMatrix(matrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap )
Image srcImage = Image.FromFile(aaa.jpg);
Bitmap resultImage = new Bitmap(srcImage.Width, srcImage.Height);
Graphics g = Graphics.FromImage(resultImage);
g.DrawImage( srcImage, new Rectangle( 0, 0, srcImage.Width, srcImage.Height ), 0, 0, srcImage.Width, srcImage.Height, GraphicsUnit.Pixel, attributes);
/// summary? /// Creating a Watermarked Photograph with GDI+ for .NET?? /// /summary?? /// param name=rSrcImgPath原始图片的物理路径/param?? /// param name=rMarkImgPath水印图片的物理路径/param?? /// param name=rMarkText水印文字（不显示水印文字设为空串）/param?? /// param name=rDstImgPath输出合成后的图片的物理路径/param?? /// @整理:anyrock@mending.cn?? public void BuildWatermark(string rSrcImgPath,string rMarkImgPath,string rMarkText,string rDstImgPath)?? {?? ???? //以下（代码）从一个指定文件创建了一个Image 对象，然后为它的 Width 和 Height定义变量。?? ???? //这些长度待会被用来建立一个以24 bits 每像素的格式作为颜色数据的Bitmap对象。?? ???? Image imgPhoto = Image.FromFile(rSrcImgPath);?? ???? int phWidth = imgPhoto.Width;?? ???? int phHeight = imgPhoto.Height;?? ???? Bitmap bmPhoto=new Bitmap(phWidth,phHeight, PixelFormat.Format24bppRgb);?? ???? bmPhoto.SetResolution(72,72);?? ???? Graphics grPhoto = Graphics.FromImage(bmPhoto);?? ???? //这个代码载入水印图片，水印图片已经被保存为一个BMP文件，以绿色(A=0,R=0,G=255,B=0)作为背景颜色。?? ???? //再一次，会为它的Width 和Height定义一个变量。?? ???? Image imgWatermark = new Bitmap(rMarkImgPath);?? ???? int wmWidth = imgWatermark.Width;?? ???? int wmHeight = imgWatermark.Height;?? ???? //这个代码以100%它的原始大小绘制imgPhoto 到Graphics 对象的（x=0,y=0）位置。?? ???? //以后所有的绘图都将发生在原来照片的顶部。?? ???? grPhoto.SmoothingMode = SmoothingMode.AntiAlias;?? ???? grPhoto.DrawImage(?? ????????? imgPhoto,???????????????????????????????????????? ????????? new Rectangle(0, 0
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