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Google Picasa "Sunset" version - Mini-Review and anchor-point

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IainB:
EDIT 2018-04-07:
Added/modified to the OP and the Indexing post below it:

* Using Tags in Picasa.  Can be used as a very powerful tool for creating persistent "virtual albums" by tagging random images to create a subject-specific album. (NB: Has to be tried to be appreciated.)
* Re: Google Picasa "Sunset" version - Picasa Tags and creation of virtual albums
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IainB:
Cross-posted her for information/relevance, from another discussion thread on the DC forum:
@phillie08:
Yes, the simple explanation would seem to be that the cached thumbnails that are of concern to you - and which do not contain the latest artefacts in the original image and that were added to that image - could probably be of an earlier version of the image. One can only suppose as to why the cached thumbnail was not updated.

Those thumbnails will have been created by the Windows OS and stored in a database/cache - which is an accumulator and will contain thumbnails of since-deleted/changed image files.
It is thus generally a good housekeeping practice to periodically run cleanmgr.exe (in Admininstrator mode and set to to clean up system files). When doing this, ensure that there is a tick against the "Thumbnails" item. For example:
-IainB (October 23, 2018, 06:05 PM)
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The example screenshot above shows 26.0MB of Thumbnails - which is not much really and is usually larger (I had already not long ago run cleanmgr.exe before taking this screenshot).
It can be educational to search the system with Everything for files with "thumb  .db" (with the embedded space). That will identify all the Thumbnail-related files that comprise the 26.0MB  - in my case, they are mostly/all in:
C:\Users\[UserID]\AppData\Local\Microsoft\Windows\Explorer\

Those files will have names with "thumbcache" in them - e.g. "thumbcache_768.db".

An Everything search will also be able to show you where all the "Thumb" and "Thumb  .db' named files are, so that you can delete them as necessary. Generally, system "Thumbs.db" files are to be found in all those directories where images are stored. They are Windows OS system files (caches), but it doesn't hurt to periodically sweep them up in a housekeeping run - e.g., using Everything to identify them prior to deletion - since they are accumulators and could contain thumbnails of since-deleted/changed image files (hence the problem discussed here), so that, over time, they could become bloated with useless garbage. The Windows OS will recreate anew the deleted thumbnail cache - with up-to-date thumbnails - as and when it is forced to open those image files again for any purpose.

If you use third party image file managers - e.g., (say) Picasa3 - then, from experience, you will generally find that they create and update their own peculiar thumbnail caches/databases. For example, in my case, Picasa3 builds several thumbnail and preview database files (caches) that are approx 2GB in size.    :o

So, in my case, I would therefore tend to leave well enough alone there, since Picasa3 will have done a lot of work to deliberately build those caches, rather than rely on the Windows OS thumbnail caching system. So far, Picasa3 never seems to have displayed for me the outdated cached thumbnail problem discussed here. I suspect that the Picasa3 cache build and maintenance processes will have been designed for optimum performance (efficiency and speed) - i.e., with garbage removed periodically by Picasa3 systematically updating the thumbnails cache after an image is deleted/changed.
-IainB (October 23, 2018, 06:05 PM)
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