Rendered EXR image doesn't have full high dynamic HDR range

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1

Rendered EXR image doesn’t have full high dynamic HDR range. It works fine for ranges above SDR like overexposed skies but it doesn’t include dark shadow areas. This is why sometimes is hard to recreate original D5 image inside Photoshop because EXR doesn’t include low-end HDR data and it even loose saturation too.

It is noticeable in Photoshop Camera Raw “plugin” because it completely doesn’t know which range is dark and which is shadow. It treat shadows as 80% of EXR image and dark areas as like 5% of them. Night views rendered from D5 completely doesn’t work in Camera Raw inside Photoshop.

It looks like rendered EXR is a fake HDR image just like parts of SDR range were moved above this range to simulate high dynamic bright overexposed areas but after that we loose dark areas inside HDR range. This SDR range should be stretched not moved I think.

I will show examples tomorrow.

2

Which one did you use?
image

  • In theory, we do not perform any special handling for the raw output.
3

Raw of course. I will send video from Photoshop Camera Raw tomorrow when I will do post fx. With included exr. It is not fully range HDR. It has missing low-end shadows data.

Please render low light simple scene like evening, night and load to any software that can load HDR images and do tone-mapping.

4

Ok, please send over the night scene images in .exr(raw) format.

5

As I remember some years ago the same problem was in Octane and Redshift renderer. Probably GPU renderers have problem to collect full HDR data. But they after some updates resolved this.