In praise of AA filters

Started Oct 23, 2013 | Discussions thread
rovingtim
Veteran MemberPosts: 8,234
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Alias artifacts don't only occur in man-made objects
In reply to Tom Axford, Oct 25, 2013

Once you take out the AA, the software of the camera necessarily much finish off partial signals. If it gets it 'right', it is rarely noticed. However, when it gets is wrong, we used to call that an artifact. Regardless, it is software invented 'detail'.

As someone point out to me, ever taken a shot of a stubbled man with a no AA camera and seen the occasional massive beard hair? Ever noticed how a camera with no AA will happily capture sharp detail of brickwork and then suddenly it go blank like someone blurred it in photoshop? Then a little further on, more sharp detail. No gentle transition.

Ever notice that some leaves on the trees look 'crunchy'? Ever notice that the colour shifts in busy areas of a landscape? For example, a clump of trees looks to be in a faintly purple shadow where none exists.

Ever notice that some 'photographers' are constantly striving to improve their ability to overlook the increasing alias artifacts of modern cameras?

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