I wonder if the "Detail" part could be the two Render Engines themselves and how they handle various materials. I have not been active here for some time but I have been lurking and reading virtually EVERYTHING since P12 came out. I have heard a lot about the two engines and some differences they have but not actually been playing back and forth but rather just trying to learn Physical Base nodes and Cycles. Which is why I am not certain I can even take my current scene back into P11 for a useful comparison.

In my current project I have used a Render Setting provided by Ghostship provide in one of their recent products labeled "CPU Final" Adaptive Sampling then tweaked the values way up to bake the image; currently about an hour+ render time opposed to original settings that render in about 15-20 minutes (on my system).

But as I have not grasped what JoEtzold was saying; "Pixel Dimension" is the Constant (provided you don't allow the image editor to 'resample') It does appear that P12 is saving out the programed values but just writing the file's 'Properties' incorrect - which is what, in my case, a Printer is going to use to put to paper.....so that, at this time, must be manually edited before sending to print.

As I recall many years ago (P3, 4, maybe 5) the engineers back then once said that Poser had a limit of "Dpi" (dots per inch) that it's algorithms could produce...long time ago but for conversation I will say 150dpi (?) so I was told that even thou I can Input '600dpi' the actual render would never truly be rendered above 150dpi. So perhaps a question....for 'Render to Print' .....might be: What is Poser 12's true capability of Dpi

Yes I grasp now "Pixel Dimension" but within that 'dimension' there is a set number of 'pixels' - Seeing as Poser if labeling the output file as "72dpi" within the Pixel Dimension set; Is 72 dots per inch really all the Render Engine capable of doing? Or if I ask for 3000x3000 Pixels, can it 'see' to rendering 300 dots per inch within that area? Or will you always only get (at digital level) 72 rendered dots per inch within the area?

I guess I am not trying view the Render Engine from a CCD element point of view.... how many Dots can it see/render within a One Square Inch area?