[Therion] xTherion will not open JPG backgrounds

[Footleg]

Possibly related to the jpg support on Windows, I discovered in the last
week that when using a jpg as a bitmap overlay for a surface mesh in
Therion to build a LOX file, the jpg is not rendered in the Loch viewer if
it was saved with the progressive encoding option checked in Gimp.

Footleg

On Tue, Jan 27, 2026 at 8:20 PM <mike at mikemccombe.co.uk> wrote:

> I think I had the same problem a month or two ago using Therion on
> Windows. My solution was to load my jpeg into gimp and then export it with
> all of optional jpeg coding extensions turned off - so I had what you might
> call a "20 century jpeg". Therion on Windows was happy with this.
>
> Mike McCombe
>
> > -----Original Message-----
> > From: Therion <therion-bounces at speleo.sk> On Behalf Of Bill Gee
> > Sent: 27 January 2026 19:07
> > To: Therion Mail List <therion at speleo.sk>
> > Subject: Re: [Therion] xTherion will not open JPG backgrounds
> >
> > Update - Argh!!  This is frustrating.  It is sort of like the Linux
> version of DLL
> > Hell.
> >
> > Apparently when I did the system updates a few weeks ago, the tkimg
> package
> > removed itself from tcl 8.6 and added itself to tcl 9.0.  I searched
> through some
> > old emails (lucky I still have them!) and found a thread from August
> 2025.  The
> > solution in that thread was to modify the xtherion program so it
> executed in
> > wish8.6 instead of wish 9.
> >
> > Repeating my tests from then - I found that package Img is no longer
> available
> > in tcl 8.6.  I changed xtherion to call wish 9.0, and now it works.  JPG
> > backgrounds will now load.
> >
> > The solution in August was to switch to TCL 8.6.  The solution this
> > month is to switch to TCL 9.0.   Sheesh ...
> >
> > bgee at main2:~$ tclsh8.6
> > % package require Img
> > can't find package Img
> > % exit
> > bgee at main2:~$ tclsh9.0
> > % package require Img
> > 2.1.0
> > % exit
> > bgee at main2:~$
> >
> >
> > ===============
> > Bill Gee
> >
> > On 1/27/26 12:41, Bill Gee wrote:
> > > Dang it ...  I remember seeing this problem some months ago, probably
> > > in June, but now cannot remember how I fixed it.
> > >
> > > Therion 6.3.4+dev running on Fedora 43.
> > >
> > > In late December I worked on a cave map and had no problems with it.
> > > xTherion opened jpg files as backgrounds.  Today I went back to that
> > > same map, and it will not load the background jpg files.  It will open
> > > png backgrounds.  The only error I can see is in the Background Images
> > > field.  It shows the name of the jpg file and adds "(unknown)" at the
> end.
> > >
> > > I checked both tkimg and libjpeg.  They are installed.  What else is
> > > required for this to work?
> > >
> > > I started xtherion from a command shell.  There were no additional
> > > error messages.  Is there a log file somewhere that might give more
> clues?
> > >
> > > In early January I ran the usual update process for all packages.
> > > Both tkimg and libjpeg were updated.  I don't see anything that was
> > > removed other than old kernels.
> > >
> > > Thanks!
> > >
> >
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>
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