Roger, Shecky,
The Piranesi gallery shows that Piranesi can help you produce some good architectural renderings. Piranesi is a specialized 3D paint program, catering to architectural rendering, so it seems to be worthy of Roger’s consideration. However, Piranesi requires you to use a 3D program to create and/or render the 3D architectural model on which you paint with Piranesi. The compatible 3D programs are:
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http://www.informatix.co.uk/piranesi/product_information_sup p.shtml>
Purchasing Piranesi and one of the required 3D programs involves a considerable investment in money and a lot of learning curve time, but, as we have seen in the Piranesi gallery, the results can be quite good. r_harvey’s suggestion to "ask architects around you what they are using" seems like a good idea.
Photoshop plays a more minor role in all this, possibly post processing your finished rendering, resizing it, and printing it. Incidentally, Piranesi is not your only alternative for architectural renderings. A little googling should turn up other alternatives. Since these are programs intended for professional use, they won’t be inexpensive.
— Burton —