本文实例讲述了C#图像处理之霓虹效果实现方法。分享给大家供大家参考。具体如下：
//定义霓虹处理函数 public Bitmap PNihong(Bitmap a) { try { int w = a.Width; int h = a.Height; Bitmap dstBitmap = new Bitmap(w, h, System.Drawing.Imaging.PixelFormat.Format24bppRgb); System.Drawing.Imaging.BitmapData srcData = a.LockBits(new Rectangle (0, 0, w, h), System.Drawing.Imaging.ImageLockMode.ReadOnly, System.Drawing.Imaging.PixelFormat.Format24bppRgb); System.Drawing.Imaging.BitmapData dstData = dstBitmap.LockBits(new Rectangle (0, 0, w, h), System.Drawing.Imaging.ImageLockMode.WriteOnly, System.Drawing.Imaging.PixelFormat.Format24bppRgb); unsafe { byte* pIn = (byte*)srcData.Scan0.ToPointer(); byte* pOut = (byte*)dstData.Scan0.ToPointer(); byte* p; int stride = srcData.Stride; for (int y = 0; y < h; y++) { for (int x = 0; x < w; x++) { //边缘八个点像素不变 if (x == 0 || x == w - 1 || y == 0 || y == h - 1) { pOut[0] = pIn[0]; pOut[1] = pIn[1]; pOut[2] = pIn[2]; } else { int r0, r1, r2; int g1, g2, g0; int b1, b2, b0; double vR, vG, vB; //左上 p = pIn - stride - 3; //右 p = pIn + 3; r1 = p[2]; g1 = p[1]; b1 = p[0]; //正下 p = pIn + stride; r2 = p[2]; g2 = p[1]; b2 = p[0]; //中心点 p = pIn; r0 = p[2]; g0 = p[1]; b0 = p[0]; //使用模板 vR = Math.Sqrt((r0 - r1) * (r0 - r1) + (r0 - r2) * (r0 - r2)); vG = Math.Sqrt((g0 - g1) * (g0 - g1) + (g0 - g2) * (g0 - g2)); vB = Math.Sqrt((b0 - b1) * (b0 - b1) + (b0 - b2) * (b0 - b2)); if (vR > 0) { vR = Math.Min(255, vR); } else { vR = Math.Max(0, vR); } if (vG > 0) { vG = Math.Min(255, vG); } else { vG = Math.Max(0, vG); } if (vB > 0) { vB = Math.Min(255, vB); } else { vB = Math.Max(0, vB); } pOut[0] = (byte)vB; pOut[1] = (byte)vG; pOut[2] = (byte)vR; } pIn += 3; pOut += 3; } pIn += srcData.Stride - w * 3; pOut += srcData.Stride - w * 3; } } a.UnlockBits(srcData); dstBitmap.UnlockBits(dstData); return dstBitmap; } catch (Exception e) { MessageBox.Show(e.Message.ToString()); return null; } }
原图：
效果图：
希望本文所述对大家的C#程序设计有所帮助。
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