Jaff, do the following...
1) open your png
2) From the layers pallet, select and duplicate the 1 layer you see.
3) now delete the original layer.
4) Select all the deadspace surounding your flloorplan and delete to transparent. Use whatever selection tools work best for you, Magicwand works great.
5) Now resize the canvas to fit within the blank map.
5.a) Under the image menu select "Image size".
5.b) Check the "Constrain Proportions" box.
5.c) Set the dropdown menus next to height and width to "Pixels".
5.d) Now adjust the numbers as needed to make you rimage fit a max width of 418 and max height of 488. In this case, enter 488 in the height box.
You should now have your floor plan sitting on a transparent background scaled to fit inside the map blank.
6) Select all, Copy, and Paste over the map blank.
7) From the Layers menu select "Layer Style/Inner Shadow". This should bring up a dialog box with several options (Inner Shadow is selected and checked).
From here you can tweak a bunch of stuff.
Inner shadow will put a drop shadow insider the floorplan.
Dropshadow will put a shadow outside the floorplan over the map blank.
Color Overlay will tint the entire floorplan with a color. Play with the opacity and blend settings. Blend Mode/Darken will probably work best here.
Pattern Overlay will fill the floorplan with a texture. Again, play with the Blend Mode and Opacity settings.
Stroke will outline the entire floorplan. You may need to use this to clean up the edges if some of the other changes you've made beat up your original border.
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