On 25/04/2015 08:33, Thomas de Groot wrote:
> On 25-4-2015 9:13, Stephen wrote:

>
> Thanks indeed! I love that kind of historical information. Somehow, it
> finds back its way into a scene or another.The painting of Rosa Bonheur
> is typical. 19th century ray-tracing! ;-) It would be interesting to
> work on that.
>

Did you forget to say things backward? ;-)
I am not too sure if you mean Rosa Bonheur's paintings or the painting 
of her by Édouard Dubufe?

19th century ray-tracing! - Camera obscura?


>>
>> Art not science then?
>
> Certainly not ;-)
>

More like black magic to me. :-)


>>
> Yes, and with trace(), using a pigment_map with different contrasting
> colours will show where the final hues will appear. They can then easily
> be manipulated into the right combination.
>

I might dispute the "easily" bit. :-)

-- 

Regards
     Stephen

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