A common adjustment we make to digital photos is to "white balance" a photo, either in-camera or in postwork. White balancing adjusts the colors of the image so that white things look white, despite the fact that the environmental lighting actually has a color cast to it.

For example, if you're outdoors with a lot of sky showing, everything will have a blue tone to it. This makes portraits look ugly, so you always want to white balance that situation. Similarly, indoors with a light bulb, everything has an amber tone to it, and I usually like to cancel that out, too.

In our renders, when we use an IBL light probe with strong color in it, this often gives a render that looks like a photo that has no white balancing. Of course, you could take that render into a photo manipulation tool and white balance it after the fact.

Or - you can do this trick. Instead of plugging your IBL image into the Light Color, plug it into the Light Intensity.

Any Poser material node that has a numeric value is basically a gray-scale quantity, and if you plug a color into that, it gets converted to gray-scale automatically. No fuss, no muss.

So the Light Intensity channel will automatically white balance your environmental lighting in your render.

 

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