Viewport exposure different from render exposure

[J.C]

Hi,

With the latest release (9.11) I've noticed that there is a noticable exposure difference in final render compared to the viewport render.
I have to set gamma to 0.5 in Blender's Color Management tab to match both renders. Since then they are almost identical.

[Synthercat]

That seems like the bug I recently reported that was fixed on 9.10 I think

Have you clicked the "Octane Imager" tick on the Camera settings?
(The should default to ON in my opinion)

[J.C]

Weather it is ON or OFF there is still a difference.

[justavisitor]

Has this been fixed?

[Saramary]

You can't use Blender tonemapping AND OctaneRender tonemapping and expecting to have the same result in both Blender Image Editor (F12) and Render Display Mode (Shift+Z). If Octane Imager is ON, you should turn OFF Blender Colour Management completely and visa versa (except the case when you know what are you doing). Otherwise you'll be using tonemapping twice. If any of Blender's tonemapping is still ON, you'll get Blender's tonemapping added on top of the Octane's one. Converting to sRGB colour space is a part of tonemapping too.

OctaneImager.png (21.49 KiB) Viewed 5717 times

Linear workflow means that a user doesn't use OctaneRender tonemapping (Octane Imager is OFF) but uses only the Blender's one (which btw has sRGB colour space turned ON by default) or other applications to add tonemapping to an image later. This is why Octane Imager is OFF by default.
But if you turn ON Octane Imager you have to be sure that ALL Blender's Image Editor tonemapping is OFF.

[justavisitor]

If Octane Imager is ON, you should turn OFF Blender Colour Management completely

Is this correct? I've never seen it mentioned anywhere, and you'd think it would be the headline of any Octane/Blender tutorial/manual.

Also, if this information is accurate, exactly how do you do that? You emphasize that we should turn it off completely, implying there are several ways to do this and that some of those are not complete.

I googled various combinations of turn off color management and/or tonemapping in Blender, but didn't get any usuable results, so this is significantly less simple than it seems.

[J.C]

...
But if you turn ON Octane Imager you have to be sure that ALL Blender's Image Editor tonemapping is OFF....

This does the trick! I have had sRGB switched ON and that caused the difference in rendered file.
The example attached file has the proper settings for viewport and final render.