SPP sharpening exposed ..

Started Jun 3, 2012 | Discussions thread
white tea
Regular MemberPosts: 401
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My examples
In reply to white tea, Jun 11, 2012

Here I attach some photos taken few years ago with Sigma SD10+18-50 kit lens (SPP 2.4).
I wanted to print them in A4 format and then I found jaggies to be a problem.

Of course with a proper processing problem can be solved and I eventually prepared my photos to "look good enough", but since that time I have been examining each photo, searching for "step pattern". If I wanted it or not I became a pixel-peeper. Dave said, Kodak 14n and SD9 were the cameras, that trained him to see aliasing, I can only add: in my case it was SD10.

The second part of the problem, connected with this thread is, that when I learnt what was the reason of artifacts and what strenghten them I felt dissapointed. I bought Sigma camera for true, real images and suddenly I discovered, that what I see is not true or real, but artificial. It's result of processing/sharpening which is used for picture even when set to zero. I wanted to avoid false details from Bayer sensor (false in meaning of result of interpolation), then I got not entirely true details from Foveon.

And photos:
full resolution

and crop

full resolution

and crop

in this case even setting sharpness slider at -1.5 doesn't remove steps and they are visible on prints (it's the "rope problem" in full meaning of the phrase ).

Whenever I see jaggies like that it brings to my mind pictures generated by 3D software with antialiasing filter turned off.

Here is picture, that I prepared for the competition for a new (in that time) box for PS. The basic picture was rendered with resolution about 10 MPx, but for faster rendering antialiasing was 'off'. As the result pixel steps are visible.

Kind of paradox is, that stepped lines unwanted by CG specialist and games programmers are the pride of some photographers.

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Best Regards

Chris'tea'

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