10-04-2010, 10:54 PM
[quote name='RussellB' timestamp='1286230042' post='3479']
The above example photos, and the interesting arguments by Lomskij and others in the currently raging Sigma SD1 thread, remind me how much detail we may all be losing thanks to our cameras' AA anti-aliasing filters. Klaus has also published useful information on this matter.
I wonder if, with the increasing CPU power every year, AA could be implemented in software. Something along the lines of an optional blurring function, to be applied to ordinary JPEGs and/or raw files. Have not thought this through, maybe one of you brainiacs have.
And, does anybody know how to remove the Anti-Aliasing filter on my Sony Nex?
And does Klaus and other Photozone folks have an opinion on whether or not it would be field significant to have no AA filters on, say, 30cm x 40cm (hmm that's pretty big) uncropped final prints?
[/quote]
No, you can not really filter afterwards. The aliasing and moire create false detail and patterns that you can not just undo and recreate what should have been there.
It is not really about CPU power, but about procedures that can detect aliasing artifacts, and about procedures that can then "mend" the aliasing... Things are just not that simple.
You do not lose a lot of detail through AA-filters, even though it might seem that way. The example I showed was fro a D200, there are cameras with a bit less strong AA-filter. Most is false detail, though, edges where there are no edges (just because the pixels end there). You can get that apparent detail back with sharpening in software... And that software usually does not create the same amount of aliasing and normally no moire patterns at all.
You should not remove the AA-filter on your NEX. If you actually would want an AA-filter-less NEX, you should get into contact with that company I linked to.
30 x 40 is a 4/3rds or compact camera size <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/wink.gif' class='bbc_emoticon' alt='
' />. You have enough detail from any NEX to print that size, no problem. Also when you would use an AA-filter-less camera, the aliasing and moire would not really show up. You would need to print a lot bigger for that to become a problem.
In my opinion, it is a better idea to learn about sharpening in "correct" ways for good prints, which can deliver better results that shooting without AA-filter.
AA-filters do serve a purpose...
The above example photos, and the interesting arguments by Lomskij and others in the currently raging Sigma SD1 thread, remind me how much detail we may all be losing thanks to our cameras' AA anti-aliasing filters. Klaus has also published useful information on this matter.
I wonder if, with the increasing CPU power every year, AA could be implemented in software. Something along the lines of an optional blurring function, to be applied to ordinary JPEGs and/or raw files. Have not thought this through, maybe one of you brainiacs have.
And, does anybody know how to remove the Anti-Aliasing filter on my Sony Nex?
And does Klaus and other Photozone folks have an opinion on whether or not it would be field significant to have no AA filters on, say, 30cm x 40cm (hmm that's pretty big) uncropped final prints?
[/quote]
No, you can not really filter afterwards. The aliasing and moire create false detail and patterns that you can not just undo and recreate what should have been there.
It is not really about CPU power, but about procedures that can detect aliasing artifacts, and about procedures that can then "mend" the aliasing... Things are just not that simple.
You do not lose a lot of detail through AA-filters, even though it might seem that way. The example I showed was fro a D200, there are cameras with a bit less strong AA-filter. Most is false detail, though, edges where there are no edges (just because the pixels end there). You can get that apparent detail back with sharpening in software... And that software usually does not create the same amount of aliasing and normally no moire patterns at all.
You should not remove the AA-filter on your NEX. If you actually would want an AA-filter-less NEX, you should get into contact with that company I linked to.
30 x 40 is a 4/3rds or compact camera size <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/wink.gif' class='bbc_emoticon' alt='
' />. You have enough detail from any NEX to print that size, no problem. Also when you would use an AA-filter-less camera, the aliasing and moire would not really show up. You would need to print a lot bigger for that to become a problem.In my opinion, it is a better idea to learn about sharpening in "correct" ways for good prints, which can deliver better results that shooting without AA-filter.
AA-filters do serve a purpose...