outputXYZCalFormat = BasicToneMapCalFormat(inputXYZCalFormat, maxLum)

Simple tone mapping. Leaves any pixel with luminance below maxLum alone.
For pixels whose luminance exceeds maxLum, scale XYZ down multiplicatively so
that luminance is maxLum.

10/1/09 bjh, dhb Created it.
10/4/09 dhb Debug and make it work right.

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