Advantages of Foveon sensor Locked

Started Jun 23, 2013 | Discussions thread
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bobn2
Forum ProPosts: 30,224
Re: Advantages of Foveon sensor
In reply to Rudi, Jun 23, 2013

Rudi wrote:

Talking about frequency we got to talk about bandwidth too and in this respect I suggest the lecture of Dick Lion´s discours on the Foveon sensor. With the Foveon technology we get exact voltage values for each single color of the color spectrum in each single pixel position.

No, you don't. Each 'voltage' has nothing to do with the 'color spectrum' at all. It is a measure of the integration of luminous energy weighted by one of three different frequency response functions. That produces three 'stimulus' values, not any measure of spectral value. The issue here is that in the Foveon sensor those functions are very different from what they need to be to accurately calculate the three stimulus values needed fro standard RGB colour models.

The problem is to convert these values to the somehow limited 3 color RGB values

The 3 colour 'RGB' values are not 'somehow limited' - no more limited than the Foveon's ones.

and here, I think, Sigma has done a pretty good job in firmware design and SPP developement. The Foveon sensor technology is much more complex then CFA sensor technology and that is why it can´t be compared with each other on a 1:1 basis.

I'm not sure what you mean by that. In the end, someone choosing one against the other would choose what was available, for instance the 15MP Foveon against the current crop of 24MP APS-C Bayer sensors. I think they'd be found to produce very similar output, the Bayers would have better colour accuracy (though many here prefer Foveon colour), the Bayer would be cheaper and in the end the Bayer would produce 42Mb per output file while the Foveon would produce 67.5 (and require more complex processing for that). So, when someone came to compare, most of the plus features go with the Bayer.

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Bob

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