This tutorial shows how to edit 32 bit per channel HDRI bitmaps in Photoshop. It discusses the difference between 8, 16, and 32bit per channel color and how to work with Photoshop’s HDRI color palette. It also discusses how to use this data inside of Design3D.
Awesome! Does this work with photographic scenes?
Yes, you can take a standard 8-bit color image and add extra luminosity to it using similar techniques. It takes a bit of experimentation of course.