//
            //Colormap: 定义转换颜色的映射
            //
            ColorMap colorMap = new ColorMap();

            //
            //我的水印图被定义成拥有绿色背景色的图片被替换成透明
            //
            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}, // red红色
           new float[] {0.0f, 1.0f, 0.0f, 0.0f, 0.0f}, //green绿色
           new float[] {0.0f, 0.0f, 1.0f, 0.0f, 0.0f}, //blue蓝色      
           new float[] {0.0f, 0.0f, 0.0f, alpha, 0.0f}, //透明度    
           new float[] {0.0f, 0.0f, 0.0f, 0.0f, 1.0f}};//

            // ColorMatrix:定义包含 RGBA 空间坐标的 5 x 5 矩阵。
            // ImageAttributes 类的若干方法通过使用颜色矩阵调整图像颜色。
            ColorMatrix wmColorMatrix = new ColorMatrix(colorMatrixElements);

            imageAttributes.SetColorMatrix(wmColorMatrix, ColorMatrixFlag.Default,
             ColorAdjustType.Bitmap);

            //
            //上面设置完颜色，下面开始设置位置
            //
            int xPosOfWm;
            int yPosOfWm;

            switch (position)
            {
                case ImagePosition.BottomMiddle:
                    xPosOfWm = (phWidth - wmWidth) / 2;
                    yPosOfWm = phHeight - wmHeight - 10;
                    break;

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