GC.

I'll give you the novice version, okay?

Gamma correction would appear to have something to do with hardware and like that, but when dealing with Poser it actually has to do with what I consider a shortcoming in Poser (which they fixed in Pro but decided not to in 8.... don't get me started).

It's about colourspace. There's two types that concern us here: linear colour space and sRGB (or standard red-green-blue)... this from the wikipedia:
sRGB is a standard RGB (Red Green Blue) color space created cooperatively by HP and Microsoft in 1996 for use on monitors, printers, and the Internet.

Why is a bit beyond me, but for whatever reason the colours we use (from like the Microsoft colour Picker in Poser or colour images like textures - imageMap node stuff - all need to be converted to linear colour space, processed and converted back to sRGB. This is all to make Firefly happy. Cobalt dream put it this way:
Why use a linear workflow?  The colors you see on your screen are in non-linear sRGB color space.  The calculations a renderer makes are linear and produce linear results.  If you don't anti-correct colors before they reach calculations like how to shade and highlight a surface, then they make the wrong calculations.  If you don't correct the final result, then the render will be in linear color space and won't appear properly on your screen.  That means we want to anti-correct all our color inputs and correct all of our outputs.

So, it's for that middle bit - the processing - that we convert all colour information from sRGB to linear.
Then, of course, the colour information needs to be converted back to sRGB so that it displays correctly.

I hope this information doesn't freak you out too much... but it IS the unvarnished truth and the basis for 99.999% of the suckdom of non-Poser Pro images.

To my knowledge, Das Studio doesn't appear to have this issue. IF that's true, marketing or whatever, it seems a bit weird that a free product like DS should have the capacity to GC within its renderer and Poser only offers it in a Pro version.

Hmmmmmm.

Monterey/Mint21.x/Win10 - Blender3.x - PP11.3(cm) - Musescore3.6.2

Wir sind gewohnt, daß die Menschen verhöhnen was sie nicht verstehen
[it is clear that humans have contempt for that which they do not understand] 

Metaphor of Chooks