[digiKam-users] Thumbnails are in Progessive Graphics File (PGF)

Daniel Fenn danielx386 at gmail.com
Wed Apr 10 21:52:31 BST 2019

Don't quote me on this but I think piwigo stores thumbnail on the file system and not database. 

From: Gerhard Hoogterp <gerhard at frappe.xs4all.nl>
Sent: Thursday, 11 April 2019 5:11 am
To: digikam-users at kde.org
Subject: Re: [digiKam-users] Thumbnails are in Progessive Graphics File (PGF)

On woensdag 10 april 2019 20:35:58 CEST Tac Tacelosky wrote: 
> After digging around a bit, I think I have the answer to the question about 
> how the thumbnails are stored, which is PGF: 
> https://en.wikipedia.org/wiki/Progressive_Graphics_File 
> Unfortunately, I cannot for the life of me find something in PHP that will 
> convert from PGF to JPEG or PNG. 

Probably a stupid question, but... if piwigo stores its thumbnails in a 
database in a format that nobody uses, including browsers AND I see online the 
thumbnails being jpg, which makes sense since otherwise they would be useless, 
wouldn't that mean that in the piwigo code somewhere there's a conversion? 
And as I see this code on github it should be there somewhere? 

Not a piwigo user or anything, just wondering? 


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