In praise of AA filters

Started Oct 23, 2013 | Discussions thread
crames
Regular MemberPosts: 192
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Re: In praise of AA filters
In reply to Tom Axford, Oct 25, 2013

Tom Axford wrote:

...

What I did to simulate the effect:

The first 'captured' image was produced by resizing the original image to 1/8 size with no interpolation.

...

It would be more realistic to include the effect of fill factor, which in modern aa-less cameras approaches 100%. Instead your simulation approaches 0% fill factor (point sampling). You can use the Pixelate/Mosaic filter in Photoshop to add pixels together before resizing, in order to simulate fill factor.

AA-filterless with 100% fill factor looks more like this:

Without AA, 100% fill factor, shown 200%

As you can see, fill factor does a lot of the work of an AA filter. Not nearly as bad as your point-sampling example.

Cliff

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