Erick wrote:
> 
> Hi,
> I hope someone has an easy solution for my problem.
> 
> I am trying to make some images for a description of the standard model of
> particle physics, such as neutron, protons, quarks, electrons etc.
> 
> The images have to be combined and used in print. Apart from the previous
> mentioned CMYK problem (do those colors turn ugly, yagh) I have a problem
> with the background. I would like our illustrator to be able to cut out the
> 'solid' objects and place them in the desired color background. A good
> contrast between the edges and the background helps to make the result
> appear smooth.
> 
> OK, I know I can make all the background colors in POV-ray that I want, but
> it is difficult to obtain the desired color in RGB as I can't predict what
> it will be in CMYK, and the colors have to fit in the lay-out (colors of
> other images, photographs etc.).
> 
> I thought I would render all objects with a white background. When the
> background is blue or black, they look nice. However, when I choose a white
> background, they suddenly appear to be very pale. Like a color slide film
> that has received too much light. What is the best way to proceed? A problem
> is that some objects, such as the trajectory of an electron, should be
> transparent.
> 
> Should I instead of background use a plane (some shadows would be nice,
> maybe), should I change the lights or other settings or is there another
> possibility to obtain the desired result with a coloured background.
> 
> Looking forward to advise
> 
> Erick
> 

After rendering your example with various coloured backgrounds, the 
only problem I see is the emission type media which is trying to add
colour 
to the white background.

Any colour components which are greater than 1.0 when the pixels are 
written to disk are clamped to the range 0..1.  Therefore an emitting 
media can have no effect on a white background.  Perhaps you could add 
an absorbing component to your media or can you get away with a grey
background.

Cheers, PoD.

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