Glow Filter发光滤镜

最后更新于:2022-04-01 06:46:11

Glow Filter发光滤镜 Glow Filter发光滤镜是一种让图像产生发光效果的滤镜,它的实现算法如下: 1,对原图P进行高斯模糊得到图像A; 2,将P和A进行“叠加”图层混合处理,公式如下: Result(x,y) = ((basePixel(x,y) (x,y) * basePixel(x,y) / 128):(255 - (255 - mixPixel(x,y)) * (255 - basePixel(x,y)) / 128)); 注意:Result(x,y)属于[0-255]; 以上就是发光滤镜的原理。 核心代码如下: ~~~ private Bitmap GlowFilterProcess(Bitmap src) { Bitmap gaussBitmap = gf.Apply(src, 15); Bitmap dst = new Bitmap(src); int w = dst.Width; int h = dst.Height; BitmapData dstData = dst.LockBits(new Rectangle(0, 0, w, h), ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb); BitmapData gaussData = gaussBitmap.LockBits(new Rectangle(0, 0, w, h), ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb); byte* pGauss = (byte*)gaussData.Scan0; byte* pDst = (byte*)dstData.Scan0; int offset = dstData.Stride - w * 4; int gray; for (int j = 0; j < h; j++) { for (int i = 0; i < w; i++) { gray = ((pDst[0] <= 128) ? (pGauss[0] * pDst[0] / 128) : (255 - (255 - pGauss[0]) * (255 - pDst[0]) / 128)); gray = Math.Min(255, Math.Max(0, gray)); pDst[0] = (byte)gray; gray = ((pDst[1] <= 128) ? (pGauss[1] * pDst[1] / 128) : (255 - (255 - pGauss[1]) * (255 - pDst[1]) / 128)); gray = Math.Min(255, Math.Max(0, gray)); pDst[1] = (byte)gray; gray = ((pDst[2] <= 128) ? (pGauss[2] * pDst[2] / 128) : (255 - (255 - pGauss[2]) * (255 - pDst[2]) / 128)); gray = Math.Min(255, Math.Max(0, gray)); pDst[2] = (byte)gray; pDst[3] = (byte)255; pGauss += 4; pDst += 4; } pGauss += offset; pDst += offset; } dst.UnlockBits(dstData); gaussBitmap.UnlockBits(gaussData); return dst; } ~~~ 效果图如下: [![](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2016-01-05_568b33241586c.jpg)](http://www.zealpixel.com/data/attachment/portal/201507/27/181852caabbb57q5amxote.jpg) 原图 [![](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2016-01-05_568b332436ba0.png)](http://www.zealpixel.com/data/attachment/portal/201507/27/181852idiuguhof2rtwquh.png) Glow Filter效果图 最后放上一个完整的 C# 程序Demo下载地址:[http://www.zealpixel.com/thread-65-1-1.html](http://www.zealpixel.com/thread-65-1-1.html)
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