Question

我的职能是绘制一张彩色的比照图,使其处于灰色,但记忆的使用太高。我使用了沼泽地。以前使用的制版方法不出现传闻,但速度较慢。任何帮助?

        Bitmap b = a.Clone(new Rectangle(0, 0, a.Width, a.Height), a.PixelFormat);
        BitmapData bData = b.LockBits(new Rectangle(0, 0, b.Width, b.Height), ImageLockMode.ReadWrite, b.PixelFormat);
        byte bitsPerPixel = Convert.ToByte(Image.GetPixelFormatSize(bData.PixelFormat));

        /*This time we convert the IntPtr to a ptr*/
        byte* scan0 = (byte*)bData.Scan0.ToPointer();

        //Console.WriteLine(scan0);
        for (int i = 0; i < bData.Height; ++i)
        {
            for (int j = 0; j < bData.Width; ++j)
            {
                byte* data = scan0 + i * bData.Stride + j * bitsPerPixel / 8;

                data[0] = data[1] = data[2] = (byte)((data[0] + data[1] + data[2]) / 3);

            }
        }
        b.UnlockBits(bData);
        bData = null;
        return b;

Answer 1

I don t know about the memory leak but there is a better way to convert image to greyscale. Visit this page, you ll find three ways to do it, with third way called "Short and Sweet" being the fastest. And sweetest.

甚至在谷歌和互联网档案反馈机器上也找不到外部网站,但短程和轮式法则在另一个SO 回答。

Answer 2

如果你想从C#中直接写到记忆点,你需要使用“unsafe代码”。本条更具体:

http://msdn.microsoft.com/en-us/library/a288474(VS.71).aspx

友情链接