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Subject : Re: [Anaglyphs] new yellow/blue glasse's
From : Claus Krarup
To :
Date : Fri, 17 Mar 2006 19:23:51 +0100

I am not sure, but I think that the filter curves for both filters are described in the patents. Jean-Marc descriebed perfect in his earlier mail why the blue filter seems so dark. It is strange, because the amber and the blue filter has the same transmission.


Wojtek Rychlik skrev:
It would be fun to experiment with new yellow/blue glasses.
It seems to be a difficult task though. The problem is how we 
perceive blue: it is a cold color and it is less comfortable than 
warm red (more people are comfortable with red/cyan light disparity). 
Lighter blue would have been ideal, but unfortunately other colors 
trickle down through light blue filters making ghosting inevitable.
So, a dark blue must be used. Combining this with yellow it makes 
drastic light disparity and viewing discomfort (extreme, because 
we're most sensitive to yellow). To offset this one must make the 
yellow darker: add gray to it. So, we're ending up on ColorCode-type 
set of filters. So I wonder whether just dimming the yellow filter is 
the patent infringement? If it is, we can't improve anything in this 
field for the next 15 years or so.

On Mar 17, 2006, at 8:13 AM, Jean-Marc Hénault wrote:

> On my side I will try also to found better filters. I have here 
> "SpaceSpex"  yellow/blue glasses made by my friend
> Michael Stark... the blue filter is more clear but show more ghost 
> and the yellow to replace amber color also.
> I received also from a China glasses fabric and orange/blue plastic 
> glasses.... not good.
> The best for moment are ColorCode but may be with help of all of 
> you... could we found better filters...
> Sincerely,
> Jean-Marc Hénault


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