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<div class="moz-cite-prefix">Hi John,<br>
<span id="result_box" class="" lang="en"><span class=""><br>
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. <br>
<br>
I think is a program bug. <br>
<br>
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 </span></span><span
id="result_box" class="" lang="en"><span class=""><span
id="result_box" class="" lang="en"><span class="">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. <br>
<br>
Evaristo. <br>
<br>
</span></span></span></span>El 19/01/2018 a las 18:57, John
Stevens via Therion escribió:<br>
</div>
<blockquote type="cite"
cite="mid:C88F54B8551B4EB9A8DF0F0088914EF6@Study">
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial'; COLOR:
#000000">
<div>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. </div>
<div>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. </div>
<div> </div>
<div>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.</div>
<div> </div>
<div>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.</div>
<div> </div>
<div>John</div>
</div>
</div>
<br>
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