Thomas de Groot <tho### [at] degrootorg> wrote:
> On 20-1-2019 9:33, ingo wrote:


> > .gray and .hf = 0.3 * red + 0.59 * green + 0.11 * blue, so yes there's
> > quite a difference to be expected.
> >
> > ingo
> >
>
> Ah! I didn't know that!
>
> --
> Thomas

I remember that from the LOOOOOOONG thread back at:

http://news.povray.org/povray.advanced-users/thread/%3Cweb.577e597b5ff2a8e65e7df57c0%40news.povray.org%3E/?mtop=409379

(See post by Mssr Grimbert at bottom of pg 1)

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