Foveon sensor question

Started Mar 10, 2012 | Discussions thread
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Roland Karlsson Forum Pro • Posts: 25,421
Re: Foveon sensor question

gbainbridge wrote:

You may be joking,

No - I am not joking. Some paints are phosphorescent, i.e. they send e.g. out more yellow light than they recieve. Then you can have a bright yellow car that sends out a narrow band yellow light.

but a participant on another forum I inhabit is having great problems copying water colours (he uses a Pentax).

OK

He is finding that because water colours are translucent, where there is a green that results from overpainting blue with yellow, it photographs completely different to a green pigment, although they look the same to the eye. The reason of course is that although they appear the same to us, the spectra of the light they reflect is totally different.

Yes - and one reason for this is of course that our eyes are not RGB cameras. The RGB model is actually quite bad for some purposes.

Moreover - you have to be careful with your illumination. Maybe the person with problems uses some florescent lights?

You can read abut the problems here

http://en.wikipedia.org/wiki/Metamerism_%28color%29

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Roland

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