> I've got a whole bunch of declared colors that were designed for
> display_gamma 1.8 and no assumed_gamma.  How do I change them so they look
> the same under display_gamma 1.8, assumed_gamma 1?

I've solved this by raising all the colors to the 1.8 power, like this:
  pigment { rgb <.2, .5, .8> }
becomes
  pigment { rgb <.2, .5, .8> ^ 1.8 }

Hope this helps.

(To reverse this operation, simply take the (1/1.8) power instead of 1.8.)

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