[Therion] Resizing or scaling a replacement background image

[Rodrigo Severo]

On Saturday, April 4th, 2026 at 8:30 AM, Bill Gee <bgee at campercaver.net> wrote:

> I have Inkscape but have never used it for cave cartography.  I do not
> have the Therion plugin for it.  The regular xTherion interface is
> familiar and generally suitable, so I have never felt the need to go
> through another learning curve.


I would love to say that resizing and moving of background images is available on Mapiah but that is not true yet. Just included it on the 
TODO list. I expect that next version will support these actions.


Regards,

Rodrigo


> ===============
> Bill Gee
> 
> On 4/4/26 00:54, Axel via Therion wrote:
> > Moin,
> > scaling (multiple) backgrounds are no problem if u use Inkscape with the
> > Therion plugin (one of the reasons I startet using it)
> > I know it has other issues and misses some features u use, but it might
> > be a solution here...
> >
> > Axel
> > *Gesendet: *Freitag, 3. April 2026 um 19:45
> > *Von: *"Bill Gee" <bgee at campercaver.net>
> > *An: *"Therion Mail List" <therion at speleo.sk>
> > *Betreff: *[Therion] Resizing or scaling a replacement background image
> > Hello everyone -
> >
> > I am not sure how this should be handled, or if it even CAN be handled ...
> >
> > A few weeks ago we went to a section of a cave where the original sketch
> > has some problems. Rather than resketch the entire section, we took the
> > original sketch and made corrections directly on it.
> >
> > Now I want to update the Therion map. Six months ago I used the
> > original sketch as the background of a .th2 file, then drew as much as I
> > could figure out. Since the update is on the same piece of paper, I
> > figured I could just replace the original drawing background with a
> > scanned image of the updated sketch. It did not work.
> >
> > The new scanned background comes in about 1/5 as big as it needs to be.
> > The original elements I drew do not match up, so I cannot draw the new
> > stuff on it.
> >
> > I think the reason is that the original background and the new
> > background were scanned at different resolutions. I did not scan them.
> > The old background image is 2550x3300 pixels and the new is 908x1200 pixels.
> >
> > What do you suggest? Is there a way to stretch the new background so it
> > fits under the existing drawing?
> >
> > It might be easiest to ask for a rescan. The new scan might still not
> > line up. Is there a way to shift the background? I think there is. I
> > have managed to do it a few times by accident. No idea what keys I hit
> > when that happens. I have to close the .th2 without saving, then open
> > and start again.
> >
> > --
> > ===============
> > Bill Gee
> >
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