Vince,

Anthanasius has shown a mechanism for changing the brightness of an image using simple multiplication, but in a more complicated way than necessary. If all you want to do is multiply the image with a factor, simply plug it into Ambient_Color and adjust Ambient_Value as desired. That is what all the XYZ_Color/XYZ_Value pairs do. The input node is multiplied both with the color and the value.

For Poser Pro, this is usually all you would need to do. For other Poser's without gamma correction, you should use the shader I supplied with the Environment Sphere, the one called EnvPanoramic. You can use it in Pro, as well, but you don't need to if you simply want to multiply.

In my EnvPanoramic shader, set the Gamma In = 1 because the HDR image is already linear. (Or should be, anyway.)

Set the Gamma Out = 2.2 if not using Poser Pro GC.

Then set the brightness in the HSV node, using the Value parameter. In this example, I loaded a very dark night HDR and then increased the luminance by a factor of 3. This is like using a camera taking the same picture, but with an exposure 3 times longer.

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