[arch3d]

Two non destructive sliders: hue and saturation.

[numerobis]

+1
and not only in Studio but for the normal HDRI slots...

[eric nixon]

ermm, please why do you need this? I am really trying to imagine?

[arch3d]

Many of HDR images are oversaturated and i really dont want to edit native files. Not everything is easy to edit in post production (especially if you use HDRI+Emitters)

[Nasok]

+1 Those sliders would be really helpful .. at least for Saturation.

It is useful, when you're just done creating your own HDR (say in HDR Light Studio) and you've done it primary for metal material to look good .. but after a while (base on real life story ) client ask you to re-render same thing but in .. um .. gold .. and we all know that there is no black and white lights in real life .. every light has a temperature (beside the air tint) so to get realistic results you have to thin about the ambient around the light source .. and temperature of the light ..
I'm just saying that bluish shadows will not work for the gold .. as it will give you greenish tint … so simply changing the hue or saturation will save a lot of time … and will make Image Lighting tab fairly flexible thing.

Cheers.