There is a little trick with scale and ppi.
Assuming xvi-file scale is 1:100 and ppi is something like default 72.
To place generated from photoshop raster, with default ppi 300, and map
scale of 1:100 yo do not have to apply scaling on raster,
but rather specify it as a parameter to scale xvi appropriately to your
raster, i.e place a command like this to .thconfig
export map -fmt xvi \
-proj plan \
-layout-scale 3 200 \
-o bottom_plan.xvi
Then your xvi will match your raster by scale.
Also I suggest using smaller in byte size raster file formats like jpeg and
do not use png with transparency as background images,
because XTherion has troubles with such kind of png-s.
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