> Quote - > Quote - Tone mapping makes everything brighter. What is your question really about? > > would we have to anti-TM the reflection so that it would work in a car shader and for materials like a mirror? 

Yes. So for a background image, or a photo applied to EnvSphere, or something seen in a mirror, the photo is being tone mapped and you don't want to see it that way.

So - use this shader for that photo. Enter your HSV ETM exponent where the red arrow points. I was using an exponent of 2.

Plug your image into the Image_Map node.

This is an exact inverse of HSV ETM. I tested it with many exponents. It works perfectly.

Warning - any image that has pure white in it will produce infinite numbers in this calculation. To avoid that, make one change. The bottom Math_Function, Subtract, change Value_1 to 1.01. This will produce a 1% error in cancellation of the tone mapping, but it will avoid infinity.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)