A very quick bit of rummaging round in source code leads me to 

Where it shows a fall-back if the thumbnails directory cannot be created - it 
uses the tmp dir instead.


From: Elle Stone <ellest...@ninedegreesbelow.com>
Sent: 15 March 2016 14:32
To: Kevin Payne; Gimp-developer
Subject: Re: [Gimp-developer] GIMP 2.9 XCF files and digiKam, gnome file 
browsers, etc

On 03/15/2016 09:52 AM, Kevin Payne wrote:
> And just for the sake of pointless change, in 2.9.3.??? It's 
> Preferences>>System Resources
> Thumbnail creation is controlled by the "Image Thumbnails" option on 
> Preferences>>Environment
> Presumably on a Linux system they are saved in ~/.thumbnails (On my Windows 
> system it's C:\Users\username\.thumbnails )
> Kevin

Kevin, thanks! That provided a clue as to where the thumbnails might be.
I think they are being saved to "tmp" and so erased upon restarting the

Earlier today I saw the folder ".thumbnails" in my home folder. It
contained two subfolders, one called "large" and I forget what the other
one was called. Using Geeqie to take a look, there were a bunch of pngs
inside, I'm guessing from files that I worked with a long time ago. I
put this folder in the trash as the contents were useless.

I started GIMP 2.9 and opened a file. The dolphin file browser shows a
newly created folder called ".thumbnails" in my home folder, with one
subfolder called "large". GIMP created thumbnails for the XCF files that
I clicked on, but nothing was saved to the folder
"/home/elle/.thumbnails/large". As far as I could tell no other new
folder was created anywhere in my home folder.

Here are my System Resources settings:

Image Thumbnails: Size of thumbnails: Large, Maximum filesize for
thumbnailing: 512MB.

Document History "Keep record of used files in the Recent Documents
list" is checked.

The "Document History" setting doesn't actually sound relevant. Is it?

On a hunch, I checked the "tmp" folder. It seems that this is where the
GIMP thumbnails are being saved to "disk". But the tmp folder on my
computer is actually only in RAM, and all the files disappear when the
computer is restarted.

So is there some setting in Preferences that I accidentally might have
set, that tells GIMP 2.9 to save the thumbnails to "tmp" instead of to

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