C#如何实现类似QQ背景图片的边缘模糊的效果

Answer 1

多數的圖像處理控件都可以例如：
http://www.atalasoft.comhttp://www.accusoft.com

Answer 2

有没有对图片边缘进行处理的函数,或者在窗体中有这样一个图片,如何用GDI+绘制背景将图片边缘覆盖掉来模拟图片边缘模糊的效果

Answer 3

WPF
背景+渐变遮罩层就行了，GDI+没深入研究过，但是WPF实现起来很简单

Answer 4

但是我要的C# WinFrom程序,不是WPF实现,虽然没有解决,但我还是谢谢您的关注!

Answer 5

找到一个自己收藏的帖子，以前学GDI得时候参考过，你可以参考一下看看是否有价值（里面有源码和演示）
http://www.codeproject.com/KB/GDI-plus/Image_Processing_Lab.aspx

Answer 6

通过图片颜色校正。在.NET中有一个5*5的
调色矩阵ColorMatrix，可以使用这个矩阵很方便并且高效的校正图片的颜色。
这里只提供一个简单的使用ColorMatrix进行颜色校正的例子：Color color = SkinDrawMethod.ColorManage.BaseColor;        float R = (float)Convert.ToDouble(color.R) / 255;        float G = (float)Convert.ToDouble(color.G) / 255;        float B = (float)Convert.ToDouble(color.B) / 255;        float[][] matrixItems ={                            new   float[]   {R,   0,   0,   0,   0},                          new   float[]   {0,   G,   0,   0,   0},                          new   float[]   {0,   0,   B,   0,   0},                          new   float[]   {0,   0,   0,   0.38f,   0},                            new   float[]   {0,   0,   0,   0,   1}};        ColorMatrix colorMatrix = new ColorMatrix(matrixItems);        ImageAttributes imageAtt = new ImageAttributes();        imageAtt.SetColorMatrix(colorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);        int iWidth = bitmap.Width;        int iHeight = bitmap.Height;    graphics.DrawImage(bitmap, rect, 0.0f, 0.0f, iWidth, iHeight, GraphicsUnit.Pixel, imageAtt);用这段代码调整出来的颜色还是有点偏，但基本上说得过去。

Answer 7

今天研究了一天,终于想到了解决方法,贴出代码分享一下,原理就是画一个填入渐变颜色的矩形覆盖图片边缘,如果渐变的颜色和窗体的背景色相同的话就可以模拟QQ里面背景图片的效果.
 public enum BLURSTYLE
        { 
        TOP,LEFT,RIGHT,BOTTOM
        }
        public Bitmap SetEdgeBlur(string imagePath, Color backColor,int blurRange,BLURSTYLE blurStyle)
        {
            Bitmap b = new Bitmap(imagePath);
            Graphics g = Graphics.FromImage(b);
            Rectangle rect = new System.Drawing.Rectangle(b.Width - blurRange, 0, blurRange, b.Height);
           
            switch (blurStyle)
            {
                case BLURSTYLE.TOP:
                    {
                        rect = new System.Drawing.Rectangle(0, 0, b.Width, blurRange);
                        using (LinearGradientBrush brush = new LinearGradientBrush(rect, backColor, Color.FromArgb(0, backColor), LinearGradientMode.Vertical))
                        {
                            g.FillRectangle(brush, rect);                        }
                    }
                    break;
                case BLURSTYLE.LEFT:
                    {
                        rect = new System.Drawing.Rectangle(0, 0, blurRange, b.Height);
                        using (LinearGradientBrush brush = new LinearGradientBrush(rect, backColor, Color.FromArgb(0, backColor), LinearGradientMode.Horizontal))
                        {
                            g.FillRectangle(brush, rect);                        }
                    }
                    break;
                case BLURSTYLE.RIGHT:
                    {
                        rect = new System.Drawing.Rectangle(b.Width - blurRange, 0, blurRange, b.Height);
                        using (LinearGradientBrush brush = new LinearGradientBrush(rect, Color.FromArgb(0, backColor), backColor, LinearGradientMode.Horizontal))
                        {
                            g.FillRectangle(brush, rect);                        }
                    }
                    break;
                case BLURSTYLE.BOTTOM:
                    {
                        rect = new System.Drawing.Rectangle(0, b.Height - blurRange, b.Width, blurRange);
                        using (LinearGradientBrush brush = new LinearGradientBrush(rect, Color.FromArgb(0, backColor), backColor, LinearGradientMode.Vertical))
                        {
                            g.FillRectangle(brush, rect);
                        }
                    }
                    break;
                default:
                    break;
            }
            return b;
        }
        public Bitmap SetEdgeBlur(Bitmap bitmap, Color backColor, int blurRange, BLURSTYLE blurStyle)
        {
            Bitmap b = bitmap;
            Graphics g = Graphics.FromImage(b);
            Rectangle rect = new System.Drawing.Rectangle(b.Width - blurRange, 0, blurRange, b.Height);            switch (blurStyle)
            {
                case BLURSTYLE.TOP:
                    {
                        rect = new System.Drawing.Rectangle(0, 0, b.Width, blurRange);
                        using (LinearGradientBrush brush = new LinearGradientBrush(rect,backColor, Color.FromArgb(0, backColor), LinearGradientMode.Vertical))
                        {
                            g.FillRectangle(brush, rect);                        }
                    }
                    break;
                case BLURSTYLE.LEFT:
                    {
                        rect = new System.Drawing.Rectangle(0, 0, blurRange, b.Height);
                        using (LinearGradientBrush brush = new LinearGradientBrush(rect, backColor, Color.FromArgb(0, backColor), LinearGradientMode.Horizontal))
                        {
                            g.FillRectangle(brush, rect);                        }
                    }
                    break;
                case BLURSTYLE.RIGHT:
                    {
                        rect = new System.Drawing.Rectangle(b.Width - blurRange, 0, blurRange, b.Height);
                        using (LinearGradientBrush brush = new LinearGradientBrush(rect, Color.FromArgb(0, backColor), backColor, LinearGradientMode.Horizontal))
                        {
                            g.FillRectangle(brush, rect);                        }
                    }
                    break;
                case BLURSTYLE.BOTTOM:
                    {
                        rect = new System.Drawing.Rectangle(0, b.Height - blurRange, b.Width, blurRange);
                        using (LinearGradientBrush brush = new LinearGradientBrush(rect, Color.FromArgb(0, backColor), backColor, LinearGradientMode.Vertical))
                        {
                            g.FillRectangle(brush, rect);
                        }
                    }
                    break;
                default:
                    break;
            }
            return b;
        }
谢谢大家的关注