In praise of AA filters

Started 6 months ago | Discussions thread
Tom Axford
Contributing MemberPosts: 932
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Re: Pro AA filter users forget Sigma's Foveon sensor
In reply to Basalite, 6 months ago

Basalite wrote:

Wikipedia: Foveon X3 sensor

"Because demosaicing is not required for the Foveon X3 sensor to produce a full-color image, the color artifacts ("colored jaggies") associated with that process are not seen….

I think this is an example of the weaknesses in Wikipedia: the authors of the articles are unknown and sometimes exaggerate their case, or even get things wrong!

As hjulenissen has  pointed out, any sensor array will produce aliasing. In the case of an irregular array it will not produce the usual moire patterns, which is a huge advantage, but it will still give jaggies on straight edges (they may be irregular jaggies matching the irregular array).

I think the only way to alleviate these problems is to blur the image, either before or after it gets captured by the sensor.

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