[Therion] Progressive coded JPG files??

[Matěj Plch]

Hi Bill,

Can you please try to run XTherion on a new installation of Fedora 42,
for example in a virtual machine? I see that Fedora 41 has tcl 8.6,
and Fedora 42 has tcl 9, so maybe this is a leftover from a system
upgrade. Also please note that after OS upgrade you need to do a clean
rebuild of Therion, because libraries in different OS versions are
usually not binary compatible.

Matěj

út 26. 8. 2025 v 1:40 odesílatel Bill Gee <bgee at campercaver.net> napsal:
>
> Update -  It seems I do NOT have Img installed on tcl9.0.
>
> To check this, use the tcl interactive shell.
>
> bgee at main2:~$ tclsh8.6
> % package require Img
> 1.4.16
> % exit
>
> bgee at main2:~$ tclsh9.0
> % package require Img
> can't find package Img
> % exit
>
> I searched around but found nothing on how to install Img for tcl 9.0.
>
>
> ===============
> Bill Gee
>
> On 8/25/25 17:54, Bill Gee wrote:
> > Hi Olly -
> >
> > Thanks for the information.  I think it raises some new questions.
> >
> > If tkimg is required for both PNG and JPG, then why do PNG files work
> > and JPG do not?  If I have tkimg, then both should work, and if I do not
> > have it then neither should work.  Is that correct?
> >
> > How can I tell which versions of tcl have tkimg installed?  If tkimg is
> > not present, will xTherion then show an error like it does when bwidget
> > is missing?
> >
> > Looking at the code for xTherion, I see line 27254 which has "package
> > require Img".  Is that the line where tkimg is loaded?
> >
> > I have never taken steps to install either bwidget or tkimg specifically
> > for Tk/TCL.  I have only used the RPM packages from the Fedora
> > repository.  Here are the packages I have installed:
> >
> > bgee at main2:~$ rpm -qa | grep tkimg
> > tkimg-1.4.16-4.fc42.x86_64
> >
> > bgee at main2:~$ rpm -qa | grep bwidget
> > kf5-kjobwidgets-5.116.0-3.fc42.x86_64
> > bwidget-1.10.1-1.fc42.noarch
> > kf6-kjobwidgets-6.17.0-1.fc42.x86_64
> >
> > bgee at main2:~$ rpm -qa | grep tcl
> > tcl8-8.6.15-10.fc42.x86_64
> > tcl-9.0.0-7.fc42.x86_64
> >
> >
> > ===============
> > Bill Gee
> >
> > On 8/25/25 16:49, Olly Betts wrote:
> >> On Mon, Aug 25, 2025 at 10:10:32AM -0500, Bill Gee wrote:
> >>> According to this, specifying "-file $ffname" will load the image using
> >>> whatever format handler is registered for that type.  Tk includes by
> >>> default
> >>> handlers for GIF and PPM/PGM formats.  That is why PNG images still
> >>> work.
> >>
> >> Note PNG is a completely different format to PPM/PGM (and also to GIF).
> >>
> >> AIUI it you need tkimg to get support for both PNG and JPG.
> >>
> >>> So what is the deal?  What does wish really do?  Did the set of default
> >>> image handlers change between wish 8.6 and 9.0?
> >>
> >> "wish" is a windowing Tcl shell.
> >>
> >> My guess is you have tkimg installed for Tcl 8.6 but not for 9.0 (like
> >> how you had bwidget installed for 9.0 but not 8.6 until you hacked
> >> around that by adding a symlink),
> >>
> >> Cheers,
> >>      Olly
> >
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