private Bitmap to16pic(Bitmap sourceimg)
        {
            Bitmap bb = new Bitmap(sourceimg.Width, sourceimg.Height, System.Drawing.Imaging.PixelFormat.Format16bppRgb565);

            for (int i = 0; i < sourceimg.Height; i++)
            {
                for (int j = 0; j < sourceimg.Width; j++)
                {
                    bb.SetPixel(j, i, sourceimg.GetPixel(j, i));
                }
            }
           return bb;

        }

------解决方案--------------------
学习啊.
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