Hi,
Thanks for following up on this.
I tested on a blank scene. I did exactly the same process and still get the NaN.
More info; the environment mode is set to screen as I'm not using a HDRi spherical environment map/image.
I checked the image in photoshop, its RGB 8bit. So nothing special/curious there. I tried with a different completely chosen at random jpeg and the problem did not persist! So it must be my image?
I re-sized, re-saved the image multiple times in multiple formats. Still happening. I edited the levels, still happening. Tried with native bitmap texture node. I even took a screenshot of the image and pasted it into a new file... all still gives me the error!
The only luck I had was to change the levels in Photoshop insanely, so it was almost a grey image. No error then. So what's causing this?
The image came from dji drone and happens for all the images in this set.
I'll upload the original image into the private upload area.
Thanks :)