Everything I do in 3D is geared toward animation. I make absolutely sure that whatever I do after the render can be done easily if I decided to animate the scene. So I have no problems with this, except for: "1. No interaction with the image should be necessary after the 'Render' button is hit (except to add a signature and possibly fix the exposure of the image)" You realize that leaves out EVERY major professional 3D/CG studio in the known universe. LOL.

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Tools :  3dsmax 2015, Daz Studio 4.6, PoserPro 2012, Blender v2.74

System: Pentium QuadCore i7, under Win 8, GeForce GTX 780 / 2GB GPU.