So, I've generally been a convert to using gamma correction for a while now, but every now and again something crops up that makes me wonder if there arn't still a few issues with how it's been implemented in Poser (specifically render GC).

The thing that bothers me most is what happens to the shading at the terminator between light and shadow on a model. It seems to my eyes that GC overly sharpens that transition right at the terminator, leaving a harsh line. We've discussed this before but I couldn't track down the thread.

To illustrate, in the above test I have two primitive spheres, one low and one very high res (I thought there may have been a geometry issue but apparently not), lit very simply with one infinite light (similar occurs with spotlights) at 100 percent intensity with RT shadows enabled. The balls have a simple diffuse/specular material setup, one ball coloured blue. Each image was rendered using exactly the same settings except for the GC and TM options (the TM options were set at 2.2, although it's usually recommended to use them at lower settings). No IDL or SSS was used.

The results actually startled me a little, as not only did the non GC image have a better transition at the terminator, but the GC 2.2 image appears to have shading artifacts running along it (shows clearly on the coloured ball).

The TM renders have a much better transition to me, but since TM is a post filter it seems more difficult to work it's use into a linear workflow (or maybe I'm not understanding the functionality).

I'm considering a bug report to SM regarding the GC artifacts, but I want to run it by you guys to see if it's reproducable.

I'm running PP2012x64 SP1 for this test.

 

PoserPro2014(Sr4), Win7 x64, display units set to inches.

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