Hjg.Pngcs.PngWriter.FilterRowAverage C# (CSharp) Method

        private void FilterRowAverage()
        {
            int i, j, imax;
            imax = ImgInfo.BytesPerRow;
            for (j = 1 - ImgInfo.BytesPixel, i = 1; i <= imax; i++, j++) {
                rowbfilter[i] = (byte)(rowb[i] - ((rowbprev[i]) + (j > 0 ? rowb[j] : (byte)0)) / 2);
            }
        }