使用c删除jpeg图像的exif数据中除两个字段以外的所有字段#

这个怎么样:

Bitmap bmp = new Bitmap("C:\\Test\\test.jpg");

foreach (System.Drawing.Imaging.PropertyItem item in bmp.PropertyItems)
{
    if (item.Id == 0x0112 || item.Id == 0x0132)
        continue;

    System.Drawing.Imaging.PropertyItem modItem = item;
    modItem.Value = new byte[]{0};
    bmp.SetPropertyItem(modItem);
}

bmp.Save("C:\\Test\\noexif.jpg");

这是身份证表供参考: https://msdn.microsoft.com/en-us/library/system.drawing.imaging.propertyitem.id(v=vs.110).aspx

0x0112 -方向

0x0132 -日期/时间

我终于想出了如何移除 全部的 不需要的exif标签。

剩下的也可以修改。

  // remove unneeded EXIF data
  using (ImageFactory ifact = new ImageFactory()) {
    ifact.PreserveExifData = true;
    ifact.Load(ImageFilename);
    // IDs to keep: model, orientation, DateTime, DateTimeOriginal
    List<int> PropIDs = new List<int>(new int[] { 272, 274, 306, 36867 });
    // get the property items from the image
    ConcurrentDictionary<int, PropertyItem> EXIF_Dict = ifact.ExifPropertyItems;
    List<int> foundList = new List<int>();
    foreach (KeyValuePair<int, PropertyItem> kvp in EXIF_Dict) foundList.Add(kvp.Key);
    // remove EXIF tags unless they are in the PropIDs list
    foreach (int id in foundList) {
      PropertyItem junk;
      if (!PropIDs.Contains(id)) {
        // the following line removes a tag
        EXIF_Dict.TryRemove(id, out junk);
      }
    }
    // change the retained tag's values here if desired
    EXIF_Dict[274].Value[0] = 1;
    // save the property items back to the image
    ifact.ExifPropertyItems = EXIF_Dict;
  }