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"Yes you can!" Use the layer function and copy one map as a layer onto
the other, varying the opacity/transparency of the layers. If you have
outlines or contours, you may select the lines only, leaving the area
between completely transparent. But the maps must overlap exactly, so
you may have to rotate and resize them till they do, could be a lot of
work. Their geometry must be the same, similar projections. There are
other functions also, distorsion, skewing etc. which may help with such
problems. There are more advanced applications for making map overlays
with stretching functions, much used by historical geographers, but
you'll have to ask others about that.
Kind regards
Göran Bäärnhielm, ex-maplibrarian
**********************************************************
Göran Bäärnhielm
Grindsgatan 35, SE-11857 Stockholm, Sweden
Tel. +46-8-6437741, Mobile +46-768-362848
[email protected]
http://goran.baarnhielm.net/
**********************************************************
Larry Miller skrev:
This is a MapHist list message (when you hit 'reply' you're replying to the
whole list)
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------------------------------------------------------------------------
Does anyone know if it is possible to create a transparent map overlay
using Photoshop?
I am using a current city street map and laying it over a city map from
the 19thy century.
Larry Miller
[email protected]
------------------------------------------------------------------------
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MapHist: E-mail discussion group on the history of cartography
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the author and do not necessarily reflect those of the University of
Utrecht. The University of Utrecht does not take any responsibility for
the views of the author.
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