Have you set the render mode to linear?

Yep. And to not auto-convert *.exr or *.hdr

In fact even switching between sRGB and Linear doesn't change the look of the blur...

Hi Eric,

The Blurrer module should work with HDR.

For further investigation, can you share the image with us in its original format?

Warmest regards,

Hi Eifert. 

Thanks for chiming in.
I sent the EXR via Mail to support@

Cheerio.

Eric.

Hi Eric,

Thank you for sending the image, we found no issue with it.

 I am guessing you are rendering this image as the sky or environment map, like this:

If it is connected to a shader like in the above screenshot, you will have to set the rendering Camera to HDR Out:

Warmest regards,

Hi,

A small quick tip.
You can check the highest intensity in an image/video using the Measurer module. Like this:

Warmest regards,

Hi Eifert. 

Thanks for the reply. My setup looks a little different though, since I'm converting the spherical map to a DDS Cube like so:

So the Blurrer is directly after the HDRI Image in,
Since blurring the cross after the Camera-Render_CUBE leads to unwanted artifacts.
The Renderer is set to HDR out, but measuring the output of the Blurrer looks quite different from what you see...

CheCheers.

Eric.

PS:

It works as you described with rather low blur radius values.
Maybe it's a difference between how blur work in Fusion vs Axy, which I need to get used to :-)
But. yes, I stand corrected. With lower radius values the superbrights are still measurable.