In praise of AA filters

Started Oct 23, 2013 | Discussions thread
John Sheehy
Forum ProPosts: 16,216
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Re: Pro AA filter users forget Sigma's Foveon sensor
In reply to Tom Axford, Oct 27, 2013

Tom Axford wrote:

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

The real solution is to have such a pixel density that it never happens at all, but that is slow in coming.  In the meanwhile, you either have to blur before capture, or suffer the consequences of aliasing.  Of course, the problem lies not just in capture but display; even if you had a 2GP sensor, you would still have to alias the image to some degree to make it look crisp on a large-pixel monitor.  Ideally, it should take about 3 pixels to transition in full contrast in both capture and display.  Such data is relatively impervious to spatial artifacts, even with geometric corrections.

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