毫秒级的时间处理图片

毫秒级的时间处理上G的图片

 

测试环境：

测试图片（30M）：

测试计时方法：

Stopwatch sw1 = new Stopwatch();
sw1.Start();
//TODO......
sw1.Stop();
string xx = sw1.ElapsedMilliseconds.ToString();
MessageBox.Show(xx);

方法一，（1张30M图片，用时799毫秒）

public Image getThumbNailUsingGetThumbnailImage(string fileName)
{
    Image img = Image.FromFile(fileName);
    return img.GetThumbnailImage(300, 300, null, IntPtr.Zero);
}

方法二，（1张30M图片，用时1329毫秒）

public Image createThumbnailUsingGDI(ref Image imgPhoto, int destWidth, int destHeight)
{
    int sourceX = 0;
    int sourceY = 0;

    int destX = 0;
    int destY = 0;
    int sourceWidth = imgPhoto.Width;
    int sourceHeight = imgPhoto.Height;

    Bitmap b = new Bitmap(destWidth, destHeight);

    Graphics grPhoto = Graphics.FromImage(b);

    grPhoto.FillRectangle(Brushes.DarkGray, new Rectangle(destX, destY, destWidth, destHeight));
    grPhoto.DrawLine(new Pen(Brushes.LightGray), new Point(0, destHeight - 1), new Point(destWidth, destHeight - 1));
    grPhoto.DrawLine(new Pen(Brushes.LightGray), new Point(destWidth - 1, 0), new Point(destWidth - 1, destHeight));
    //shade right
    grPhoto.FillRectangle(Brushes.White, new Rectangle(destWidth - 3, 0, 7, 2));
    grPhoto.FillRectangle(Brushes.White, new Rectangle(destWidth - 2, 0, 7, 4));
    grPhoto.FillRectangle(Brushes.White, new Rectangle(destWidth - 1, 0, 7, 6));

    //shade botton
    grPhoto.FillRectangle(Brushes.White, new Rectangle(0, destHeight - 3, 2, 7));
    grPhoto.FillRectangle(Brushes.White, new Rectangle(0, destHeight - 2, 4, 7));
    grPhoto.FillRectangle(Brushes.White, new Rectangle(0, destHeight - 1, 6, 7));
    grPhoto.DrawImage(imgPhoto, new Rectangle(destX + 2, destY + 2, destWidth - 7, destHeight - 7), new Rectangle(sourceX, sourceY, sourceWidth, sourceHeight), GraphicsUnit.Pixel);

    grPhoto.Dispose();
    return b;

}

方法三，（1张30M图片，用时1636毫秒）

public Image getThumbNailWithFrame(string fileName)
{
    FileStream fs = new FileStream(fileName, FileMode.Open);
    Image im = Image.FromStream(fs);
    Size szMax = new Size(300, 300);
    Size sz = getProportionalSize(szMax, im.Size);
    // superior image quality   
    Bitmap bmpResized = new Bitmap(sz.Width, sz.Height);
    using (Graphics g = Graphics.FromImage(bmpResized))
    {
        g.InterpolationMode = InterpolationMode.HighQualityBicubic;
        g.FillRectangle(Brushes.White, 0, 0, sz.Width, sz.Height);
        int FrameWidth = 5;//decides the frame border width
        g.DrawRectangle(new Pen(Color.Silver, FrameWidth - 2), 0, 0, sz.Width - 1, sz.Height - 1);
        FrameWidth += 5;//decide the frame width
        g.DrawImage(im, new Rectangle(FrameWidth, FrameWidth, sz.Width - FrameWidth * 2, sz.Height - FrameWidth * 2), new Rectangle(Point.Empty, im.Size), GraphicsUnit.Pixel);
    }
    im.Dispose(); im = null;
    fs.Close(); fs.Dispose(); fs = null;
    return bmpResized;
}

private Size getProportionalSize(Size szMax, Size szReal)
{
    int nWidth;
    int nHeight;
    double sMaxRatio;
    double sRealRatio;

    if (szMax.Width < 1 || szMax.Height < 1 || szReal.Width < 1 || szReal.Height < 1)
        return Size.Empty;

    sMaxRatio = (double)szMax.Width / (double)szMax.Height;
    sRealRatio = (double)szReal.Width / (double)szReal.Height;

    if (sMaxRatio < sRealRatio)
    {
        nWidth = Math.Min(szMax.Width, szReal.Width);
        nHeight = (int)Math.Round(nWidth / sRealRatio);
    }
    else
    {
        nHeight = Math.Min(szMax.Height, szReal.Height);
        nWidth = (int)Math.Round(nHeight * sRealRatio);
    }

    return new Size(nWidth, nHeight);
}

方法四，（1张30M图片，用时1664毫秒）

public Image getThumbNail(string fileName)
{
    FileStream fs = new FileStream(fileName, FileMode.Open);
    Image im = Image.FromStream(fs);
    Size szMax = new Size(300, 300);
    Size sz = getProportionalSize(szMax, im.Size);
    // superior image quality   
    Bitmap bmpResized = new Bitmap(sz.Width, sz.Height);
    using (Graphics g = Graphics.FromImage(bmpResized))
    {
        g.InterpolationMode = InterpolationMode.HighQualityBicubic;
        g.DrawImage(
            im,
            new Rectangle(Point.Empty, sz),
            new Rectangle(Point.Empty, im.Size),
            GraphicsUnit.Pixel);
    }
    im.Dispose(); im = null;
    fs.Close(); fs.Dispose(); fs = null;
    return bmpResized;
}

private Size getProportionalSize(Size szMax, Size szReal)
{
    int nWidth;
    int nHeight;
    double sMaxRatio;
    double sRealRatio;

    if (szMax.Width < 1 || szMax.Height < 1 || szReal.Width < 1 || szReal.Height < 1)
        return Size.Empty;

    sMaxRatio = (double)szMax.Width / (double)szMax.Height;
    sRealRatio = (double)szReal.Width / (double)szReal.Height;

    if (sMaxRatio < sRealRatio)
    {
        nWidth = Math.Min(szMax.Width, szReal.Width);
        nHeight = (int)Math.Round(nWidth / sRealRatio);
    }
    else
    {
        nHeight = Math.Min(szMax.Height, szReal.Height);
        nWidth = (int)Math.Round(nHeight * sRealRatio);
    }

    return new Size(nWidth, nHeight);
}

方法五，（1张30M图片，用时735毫秒）

public Image createThumbFromProperty(string file)
{
    Image image = new Bitmap(file);
    Image Thumb = null;
    PropertyItem[] propItems = image.PropertyItems;
    foreach (PropertyItem propItem in propItems)
    {
        if (propItem.Id == 0x501B)
        {
            byte[] imageBytes = propItem.Value;
            MemoryStream stream = new MemoryStream(imageBytes.Length);
            stream.Write(imageBytes, 0, imageBytes.Length);
            Thumb = Image.FromStream(stream);
            break;
        }
    }
    return Thumb;
}

方法六，（50张30M图片，237毫秒）

方法七，（50张30M图片，96毫秒）

速度最快，只要兄弟们推荐的多，我下午公布源码。^_^ 

测试结果：

方法	图片张数（张）	每张大小（M）	图片总大小	用时
方法一	50	30	1500M	39950毫秒=40秒
方法二	50	30	1500M	66450毫秒=66秒
方法三	50	30	1500M	81800毫秒=81秒
方法四	50	30	1500M	83200毫秒=83秒
方法五	50	30	1500M	36750毫秒=37秒
方法六	50	30	1500M	237毫秒
方法七	50	30	1500M	96毫秒

 

 

标签: 缩略图, C#缩略图