更改 "DateTaken" 一张照片

Changing "DateTaken" of a photo

我刚从美国旅行回来,在编辑所有照片后,我发现相机使用的是以色列时区,而不是美国时区。有7个小时的时差,所以这对我来说是个大问题。我有 175GB 的照片,但我关心 "only" 大约 350 张照片。我无法手动编辑它们的 EXIF,所以我考虑使用 C#。

这个想法是它会读取每张照片的 EXIF,获取时间,并在原始照片中将时间设置为负 7 小时。我尝试使用图像 class,但它不起作用。我尝试使用 bitmapMetadate,它成功了!我设法抽出时间做了零下七个小时,但我不知道如何节省时间。我该怎么做?谢谢!

    public static string PhotoToBeEdited(FileInfo f)
    {
        FileStream fs = new FileStream(f.FullName, FileMode.Open, FileAccess.Read, FileShare.Read);
        BitmapSource img = BitmapFrame.Create(fs);
        BitmapMetadata md = (BitmapMetadata)img.Metadata;
        string date = md.DateTaken;
        Console.WriteLine(date);
        DateTime dt= DateTime.Parse(date);
        date = dt.AddHours(-7).ToString();

        [...]

        return date;
    }

不完全是编程解决方案,但您可以使用 exiftool。我正是出于这个目的使用它。

Date/Time Shift Feature

Have you ever forgotten to set the date/time on your digital camera before taking a bunch of pictures? ExifTool has a time shift feature that makes it easy to apply a batch fix to the timestamps of the images (eg. change the "Date Picture Taken" reported by Windows Explorer). Say for example that your camera clock was reset to 2000:01:01 00:00:00 when you put in a new battery at 2005:11:03 10:48:00. Then all of the pictures you took subsequently have timestamps that are wrong by 5 years, 10 months, 2 days, 10 hours and 48 minutes. To fix this, put all of the images in the same directory ("DIR") and run exiftool:

> exiftool "-DateTimeOriginal+=5:10:2 10:48:0" DIR

您还可以设置 TimeZoneOffset 字段,以防有实际使用它的软件。

我发现的最简单的方法是使用 here 和 System.Drawing.Bitmap;

中描述的技术

代码应该是这样的:

  public void ChangeDateTaken(string path)
    {
        Image theImage = new Bitmap(path);
        PropertyItem[] propItems = theImage.PropertyItems;
        Encoding _Encoding = Encoding.UTF8;
        var DataTakenProperty1 = propItems.Where(a => a.Id.ToString("x") == "9004").FirstOrDefault();
        var DataTakenProperty2 = propItems.Where(a => a.Id.ToString("x") == "9003").FirstOrDefault();
        string originalDateString = _Encoding.GetString(DataTakenProperty1.Value);
        originalDateString = originalDateString.Remove(originalDateString.Length - 1);
        DateTime originalDate = DateTime.ParseExact(originalDateString, "yyyy:MM:dd HH:mm:ss", null);

        originalDate = originalDate.AddHours(-7);


        DataTakenProperty1.Value = _Encoding.GetBytes(originalDate.ToString("yyyy:MM:dd HH:mm:ss") + '[=10=]');
        DataTakenProperty2.Value = _Encoding.GetBytes(originalDate.ToString("yyyy:MM:dd HH:mm:ss") + '[=10=]');
        theImage.SetPropertyItem(DataTakenProperty1);
        theImage.SetPropertyItem(DataTakenProperty2);
        string new_path = System.IO.Path.GetDirectoryName(path) + "\_" + System.IO.Path.GetFileName(path);
        theImage.Save(new_path);
        theImage.Dispose();
    }

不要忘记添加 System.Drawing 程序集。 如果需要,您可能还需要根据您的文化调整 DateTime 格式

对于 .NET Core,我使用 NuGet 包 ExifLibNet (https://github.com/oozcitak/exiflibrary)

PM> 安装包 ExifLibNet

// using ExifLibrary;

var file = ImageFile.FromFile(filename);
file.Properties.Set(ExifTag.DateTimeDigitized, dateTime);
file.Properties.Set(ExifTag.DateTimeOriginal, dateTime);
file.Save(filename);