Fireflies/Noise in HDRI Created from Scene (Daz Studio 4.9.3.166 Beta)

PangurBan

Hi all

Inspired by http://download.daz3d.com/forums/discussion/134401/how-to-create-our-own-hdri-from-a-scene-in-daz I've been experimenting with creating HDRIs from existing scenes/environments, and I'm comfortable with the basics (thanks so much to the OP and responders to that thread, and to the Daz team for implementing this kind of stuff).

I'm rendering with Lens Distortion Type = Spherical, and have a Canvas = Beauty, which is outputting an EXR fine, which I then post-process in Photoshop Image->Adjustments->HDR Toning, which gives me a 4700x2000 EXR, zoomed-out screenie attached. This looks fine at distance. However, looking close up, I get noise/fireflies as per second screenie.

I've tried Firefly Filter = Enabled and Noise Filter = Enabled, but those don't seem to resolve it.  I think I'm probably doing something daft in the way I render the Beauty Canvas (which is new to me, I'm still learning/practicing on canvasses), but does anyone have tips on what I may be doing wrong, and could suggest where I could improve my image? For example, would more ambient lighting help, I've seen grain similar to this in underlit scenes before?

Thanks

Al / Pangur Ban

PS: I'm using Daz Studio 4.9.3.166 Pro 64bit Beta if that helps