I don't think it's been mentioned before, just not sure though.

It actually only needs to be an empty media statement to cause the extra
brightening. I wouldn't expect to see a change like this so I, too, wonder
if it is a fault somehow. Supposed to be additive or multiplicative when a
media exists, yes, but I guess this means it does something beyond that.

Putting a density {rgb 0} into the second media without anything else
doesn't have any affect. Neither does a scattering rgb 0, of course, only a
raised scattering does.

Out of curiousity I added a third empty media statement and further
increased the brightness due to it, so it is cumulative.

Bob H.

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