/photos/community?hl=ja
/photos/community?hl=ja
2017/10/29
元の投稿者
Bjoern Hassler

What exif/GPS tags are used for sorting in Google Photos album?

Hello,

I've uploaded a variety of pictures for different sources (phone, cameras, etc) into a Google Photo album. I've adjusted the sensible "Date/Time Original", so that the pictures should form a sequence. However, it seems that Google Photos uses other timestamps.  In particular, the pictures from non-GPS devices are out form the pictures from GPS-enabled devices, which makes me think that Google photos Google Photos worked out the time zone (though adjusting the time zone tag doesn't seem to make a difference). 

Two questions:

(1) What exact exif/GPS tags are used by Google Photos to determine time order in an album?

(2) If I sync the images to disk (using Google Drive), and I adjust the metadata, will that reflect in Google Photos?

Many thanks!
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すべての返信(12 件)
2017/10/29
元の投稿者
Bjoern Hassler
It turns out that the sort order between Google photos in chrome/desktop and iOS app differs from the sort order in the android app. In the android app, my photos are ordered as I expected. However, in chrome/desktop and iOS app, they are not. I.e. the way images are sorted by time differs. I assume that is because they run slightly different queries on the underlying data store? What can be done about this?
RinusA
2017/10/29
RinusA
Google Photos works with the exposure date&time (if available) and the timezone and you best change in Photos itself if you want change the picture-order a bit without changing the original exifs. See below: 


It also is possible to change in batch: first select these pictures, then click the 3 dots and choose Edit date&time
Then you also can choose the correct timezone for the non-gps images. 

Drawback of date/time-edits on Photos: these changes are not found back in the downloads, but in general nobody downloads anything ever. 

Edits done on desktop don't sync-up via Google Drive into Google Photos, but you should check yourself, because I can't test everyday if Google has changed (or even improved :-) something. 

Problems with picture-order are quite frustrating, but for just a few you also can drag a picture to the right position: just choose Edit album under the 3 dots. 
Wait for other (better?) tips some days. 
Rinus

PS: can't say anything about differences between devices, but in general I don't trust mobiles at all due to old cached data and always work in my Chrome-browser on laptop when carrying-out such editing (seldom). 
janvb
2017/10/29
janvb
@Rinus & Bjoern

Bjoern said "I've adjusted the sensible "Date/Time Original", so that the pictures should form a sequence."
But then Google messes with date/time and/or timezone for some photos and not for others, depending on whether the photos have GPS or not or from where they are uploaded, or whatever reason. Why do'nt they just leave it alone ? I know I should ask Google, but we get no answers.

Rinus said: "Drawback of date/time-edits on Photos: these changes are not found back in the downloads"
When the correction is used to correct wrong camera settings that is a drawback indeed, but when used to correct errors introduced by Google it is good that they do not also mess with the (correct) time in the metadata. 

@Bjoern
In the meantime, re-correcting the time in batch in Google Photos seems the best work-around. Therefore you have to identify the photos taken by a given camera. That also has been an issue for a long time, but now it seems that searching with the camera name as shown in the info now works.  It seems to work for my cameras. 
2017/10/29
元の投稿者
Bjoern Hassler
Hi Jan, hi Runus,

thanks for the answers - that's really useful. I didn't know about the batch edit, but that's really useful. Searching for the full camera name provides only images by that camera (while searching e.g. for the brand produces all sorts of other picures too), and I adjusted the time on the non-GPS camera - which has worked.

Now, it turns out that with a GPS camera, the timezone is not consistent. On some pictures from that camera (usually when no GPS data was available, but not always), the timezone (as it appears in Google Photos) is set wrong, but where GPS data was recorded (and sometimes when it wasn't) the timezone was set correctly (in Google Photos). Unfortunately it's not possible to search by timezone.

With hindsight, it would have been better to upload images into albums name by camera first, so that timezone issues are more obvious. The other issue is that image info only shows the time, and not the timezone, so the problem is a little tricky to diagnose. However, the batch change timezone preview is very useful.

I'll experiment a bit more, to see what I can do - any more ideas are very welcome!
Bjoern
2017/10/29
元の投稿者
Bjoern Hassler
Hi Rinus,

Could you say a bit more about the tags? I adjusted the following tags (according to exiftool -h) prior to upload:

Date/Time Original

Create Date

Time Zone

Time Zone City

Daylight Savings


So "Time Zone" was set correctly on all images, but still not (unformly) recognised by Google Photos.

Thanks!

Bjoern

janvb
2017/10/29
janvb
@Bjoern,
Thanks for the update. Glad we could help, at least partially. But I am no timezone/time issues expert. I usually corrct wrong camera settings in Picasa3 (very easy), and all seems well, possibly because my main camera has no GPS, and I do not use the smartphone a lot.
RinusA
2017/10/29
RinusA
Same restrictions at me and in Picasa you can't set the timezone unless you add the gps-location via the Google Maps sidepanel. 

I am a bit astonished that you are using the old exiftool unless you have a lot of scanned historic prints or slides without any exif. 

There are many complaints about Google Photos in relation to correct (or preferred) ordering of pictures. 
Normally you would bypass all time & timezone problems by serial numbering your files, but GP can't handle that because the nerds at Google still have refused to add sorting by name in albums (and sorting albums by name). 

So I can't be of further help either. 
Sorry / Rinus



2017/10/29
元の投稿者
Bjoern Hassler
Hi both,

thanks again for the messages.

> I am a bit astonished that you are using the old exiftool unless you have a lot of scanned historic prints or slides without any exif. 

I was sorting out ~ 3,000 pictures from different camera sources, so batch editing on the command line was an advantage. :)

Thanks again!
Bjoern
Tomas J.
2017/12/05
Tomas J.
Thanks for this discussion! Found it while frustratingly trying to figure out why my eurotrip album photos' order is off in chunks - by varying number of hours. In my case, all photos and videos were taken by one phone (wife's iPhone). After analyzing the out of order photos by comparing them to the correct order in my hard drive backup, I figured out the issue. The fact that google photos shows different timestamps when viewing on my android phone did not help! So the issue is this - even though everything is taken on one phone, sometimes the phone was in airplane mode or had GPS turned off to save battery, etc. This caused some photos to have GPS data and some - not. However, all photos have exif data. Surprisingly, and unfortunately, Google Photos shows the proper timestamp (on desktop at least) of each photo (regardless of whether GPS data is also present), BUT, it sorts the photos using *adjusted* timestamp. By adjusted I mean photos with GPS data treat the timestamp as if it was in local time. Or possibly it's the other way around - photos without GPS data treat the timestamp as if it was in UTC time. Either way, my photo order is off due to this mess. Videos seem to have a similar issue, but it's handled differently yet again. Videos have GPS data, but no exif data, it seems, so it messes up the dates in another way.
RinusA
2017/12/05
RinusA
@Thomas
It is hopeless to read these condensed text from mobile probably - just reply on desktop in the real forumsite next time. 
Rinus


RinusA
2017/12/05
RinusA
@Thomas
Although you can edit date/time+timezones on https://photos.google.com (even in batch), you will get grey hairs by doing that. 
The chronically stupid Google teenagers always have refused to add sorting on filenumbers in albums created on Photos for such journeys since May 2015, so we are doomed to repeat constantly: please fill the feedback in the main menu of the Photos-app - maybe this will help in future to get Photos improved basically and that is no new invention, because every decent cloud has this option like Picasaweb before. 

So forget about getting this correct and do something else on desktop. 
Because these picture came from one camera, they are in the correct order in the backup-folder or at least they can be sorted on these numbers. 
Then you can upload that series to a more decent webservice like OneDrive or Dropbox to share with family and friends. 
No grey hairs anymore. 
Rinus

RinusA
2017/12/05
RinusA
@Thomas
When you want to stay at Google, you only have one option: goto https://drive.google.com/drive/my-drive and make a new folder in Mydrive named according the destiny of your yourney. 
Then select all pictures at the Google Photos icon connected to that journey and choose Move to under the 3 dots and then you select the created folder. 
In this folder you can sort by name (filenumbers) and that folder can be shared. 

Drawback: I do not like the photopresentation on Drive and there is no full screen slideshow available. 
But a bit of testing is always wise. 
Rinus

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