[Therion] Scaling problems with backgrounds in th2 files

[Evaristo Quiroga]

Hi John,

I have experienced the same zoom problems in Windows with the scroll 
wheel use or + -. If you play with the + - you see, the trace and the 
background image are well placed at 25%, 50%, 100% ,200% and 400%. When 
you push further  this scales the trace and background image are wrong 
placed. With the scroll wheel they are wrong always because the % zoom 
are normally further or between this scales.

I think is a program bug.

But we have a trick to overcome the problem. Only use the zoom button in 
the "Drawing Area" (above the "Background image" control) to choose the 
scales 25%, 50%, 100% ,200% or 400%, when you want the trace and 
background image well placed. And use scroll wheel or + - when you want 
zoom  only the trace quickly.

Evaristo.

El 19/01/2018 a las 18:57, John Stevens via Therion escribió:
> A method I used to copy from a previous survey was to export the 
> centreline as a xvi file. Then take a jpg of the old survey and scale 
> it so the pixel count matches that of the xvi file.
> The next step was to use both images as background images in the th2 
> file. A bit of adjustment of the position location to make them match 
> then it was simple to copy the old survey.
> Now I cant align the images as the zoom function now changes the 
> scales of the two images differently. If I use a jpg to trace over and 
> zoom in to trace a detailed area the scaling goes off. The resultant 
> lines are to the wrong scale and/or are misplaced.
> Is there a way of fixing the scale of a background image so it scales 
> properly. It seems to go wrong with the + – and scroll wheel.
> John
>
>
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