external viewer for layered files
I would like to use Photoshop to create a multiple layered maping system for distribution and use by others. By that I mean a file in which a basic map is always visible on the bottom layer and many additions or overlays to the base map are layered above it with "eye" control over whether they are visible or not. In this way one can create maps of the chosen area with a wide variety of chosen features (roads, structures, utility lines, special areas, etc.) visible or not.
I can get what I want by creating a multiple layer PSD file in Photoshop. Now I want to be able to distribute the layered strructure to clients who don't have Photoshop to view and print. Is there a layered file format to which the psd file can be exported and an easily available viewer / printer for the files with user control of which layers are visible as overlays? If going at this through Photoshop can't be made to work, is there another approach to get to the desired product?
