And for a more 'real-world' application, I used my test Poser subject, called "Red" (for obvious reasons *grin*).... This shows how it affects skin tones.  I used a simple linear gradient (shown in the inset box on the lower left.... blue for sky, and pink-red for earth).  Same method as described above in my notes to dhama..No other sunlight or other lights here...just the hdri image.

ps. "nudity" flag for just in case...she does wear sufficient clothes, but don't want the mods to get annoyed  grin

(Clicky on piccie for even larger version)

RosemaryR
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"This...this is magnificent!"
"Oh, yeah. Ooooo. Aaaaah. That's how it starts.
Then, later, there's ...running. And....screaming."