Am 13.09.2016 um 18:39 schrieb William F Pokorny:

> When the plane's pigment is set to color rgbft <1,1,1,1,1> and the
> background is set to anything but black, an odd inverted shadow shows up
> on the transparent plane. Could be used for special effects I guess.

Yes, setting colours to any value with finish+transmit>1 may cause quite
unexpected effects. Most notably, the effective opaque component of any
pigment is (rgb)*(1-finish-transmit), so with finish+transmit>1 you get
an effective opaque component that is /negative/.

> Does make me wonder if "color 1" should be promoted as it apparently is
> in the posted code?

Presuming that 3.7 reacts in the same manner, I'd say it should trigger
a warning.

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