Brannan滤镜

    作为第一篇文章，本人将介绍Instagram中Brannan 滤镜的实现过程，当然，是自己的模拟而已，结果差异敬请谅解。     先看下效果图：   1 PS实现步骤： 1.1 打开测试图像，复制图层，命名为图层a； 1.2 对图层a进行去色操作，然后，打开色阶-绿色-调整如下：  1.3对当前图层a选择图层混合模式-滤色； 1.4新建图层b，填充颜色RGB(36,1, 34)，选择图层混合模式-柔光，不透明度60%：  1.5新建图层c，填充颜色RGB(253,253,241)，选择图层混合模式-正片叠底： 1.6合并所有图层，即可得到相应的效果图了； 2，程序实现： ~~~ <span style="font-size:14px;">public static Bitmap DoGrayEffect(Bitmap srcBitmap, int pxMode) { Bitmap src = new Bitmap(srcBitmap); int w = src.Width; int h = src.Height; PixelFormat format = (pxMode == 0 ? PixelFormat.Format24bppRgb : PixelFormat.Format32bppArgb); BitmapData srcData = src.LockBits(new Rectangle(0, 0, w, h), ImageLockMode.ReadWrite, format); Desaturate((byte*)srcData.Scan0, w, h, srcData.Stride, pxMode); src.UnlockBits(srcData); return src; }</span> ~~~ ~~~ <span style="font-size:14px;"> //色阶调整 public static Bitmap DoLevelAdjust(Bitmap srcBitmap, int DestChannel, int InputLeftLimit, int InputMiddle, int InputRightLimit, int OutputLeftLimit, int OutputRightLimit, int pxMode) { Bitmap src = new Bitmap(srcBitmap); int w = src.Width; int h = src.Height; PixelFormat format = (pxMode == 0 ? PixelFormat.Format24bppRgb : PixelFormat.Format32bppArgb); BitmapData srcData = src.LockBits(new Rectangle(0, 0, w, h), ImageLockMode.ReadWrite, format); LevelAdjust((byte*)srcData.Scan0, w, h, srcData.Stride, DestChannel, InputLeftLimit, InputMiddle, InputRightLimit, OutputLeftLimit, OutputRightLimit, pxMode); src.UnlockBits(srcData); return src; }</span> ~~~ ~~~ <span style="font-size:14px;">//图层混合模式 public static Bitmap DoEffect(Bitmap srcBitmap, Bitmap mxBitmap, int pxMode, int effectMode) { Bitmap src = new Bitmap(srcBitmap); Bitmap mx = new Bitmap(mxBitmap); int w = src.Width; int h = src.Height; PixelFormat format = (pxMode == 0 ? PixelFormat.Format24bppRgb : PixelFormat.Format32bppArgb); BitmapData srcData = src.LockBits(new Rectangle(0, 0, w, h), ImageLockMode.ReadWrite, format); BitmapData mxData = mx.LockBits(new Rectangle(0, 0, w, h), ImageLockMode.ReadWrite, format); DoSpecialEffect((byte*)srcData.Scan0, (byte*)mxData.Scan0, w, h, srcData.Stride, pxMode, effectMode); src.UnlockBits(srcData); mx.UnlockBits(mxData); return src; } //单色图层混合模式 public static Bitmap DoSingleColorEffect(Bitmap srcBitmap, int r, int g, int b, int pxMode, int effectMode) { Bitmap src = new Bitmap(srcBitmap); int w = src.Width; int h = src.Height; PixelFormat format = (pxMode == 0 ? PixelFormat.Format24bppRgb : PixelFormat.Format32bppArgb); BitmapData srcData = src.LockBits(new Rectangle(0, 0, w, h), ImageLockMode.ReadWrite, format); byte* p = (byte*)srcData.Scan0; int seg = (pxMode == 0 ? 3 : 4); for (int y = 0; y < h; y++) { for (int x = 0; x < w; x++) { DoPixelEffect(p, r, g, b, effectMode); } } src.UnlockBits(srcData); return src; }</span> ~~~ ~~~ <span style="font-size:14px;"> //Brannan 滤镜 public static Bitmap BrannanFilter(Bitmap srcBitmap, int pxMode) { Bitmap temp = DoGrayEffect(srcBitmap, 0);//去色 Bitmap leBmp = DoLevelAdjust(temp, 2, 0, 128, 232, 0, 250, 0);//绿色色阶调整 Bitmap filterBmp = DoEffect(srcBitmap, leBmp, 0, (int)EffectMode.MODE_FILTERCOLOR);//滤色 temp = DoSingleColorEffect(filterBmp, 22, 1, 20, 0, (int)EffectMode.MODE_SMOOTHLIGHT);//柔化 temp = DoSingleColorEffect(temp, 253, 253, 241, 0, (int)EffectMode.MODE_MULTIPLY);//正片叠底 return temp; }</span> ~~~ PSD文件及C代码DEMO免费下载链接：[点击打开链接](http://download.csdn.net/detail/trent1985/8055639) **最后，分享一个专业的图像处理网站（微像素），里面有很多源代码下载：** [http://www.zealpixel.com/portal.php](http://www.zealpixel.com/portal.php)