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Mark Hahn March 9th, 2009 03:54 PM

Quote:

Originally Posted by Daniel Browning (Post 1025026)
Those are aliasing artifacts.

When the bus first starts to come into focus, its front grill (and only the grill) is covered with green and orange aliasing. Don't see any blue in the aliasing though. Even though I just calibrated my monitor, it is cheap and the green I see might be blue on another monitor.

Daniel Browning March 9th, 2009 04:00 PM

Quote:

Originally Posted by Mark Hahn (Post 1025028)
When the bus first starts to come into focus, its front grill (and only the grill) is covered with green and orange aliasing. Don't see any blue in the aliasing though. Even though I just calibrated my monitor, it is cheap and the green I see might be blue on another monitor.

I see green and orange too.

Ozan Biron March 9th, 2009 04:08 PM

Quote:

Originally Posted by Daniel Browning (Post 1025026)
Those are aliasing artifacts.

ya dats what i figured...

http://www.ozan.ca/mk2/MVI_0243(00122).jpg (Zoom closer to see those blue/green lines)

Soo what do i do know? Its soo bad in a few shots that the client aint to happy. Jst sounds liek alot of reshoots.

Is there anything i can do to try to prevent this? Bring down sharpen in the menu? Use another preset?

Mark Hahn March 9th, 2009 04:16 PM

Quote:

Originally Posted by Ozan Biron (Post 1025038)
ya dats what i figured...

http://www.ozan.ca/mk2/MVI_0243(00122).jpg (You have to zoom closer to see those blue lines)

What you call blue, I call green, and except for the brief serious bus grill problem I'd have no problem selling that footage. Most of the thing your arrows point to, fall into the "pixel-peeping" category. Any particular one, except for the bus grill, could be touched up pretty easily but I wouldn't take the trouble.

Daniel Browning March 9th, 2009 04:25 PM

Quote:

Originally Posted by Ozan Biron (Post 1025038)
Bring down sharpen in the menu?

There will still be a ton of aliasing even with sharpening down all the way. Presets cannot fix this problem.

Quote:

Originally Posted by Ozan Biron (Post 1025038)
Is there anything i can do to try to prevent this?

One unlikely possibility is to use a camera that does not skip 2 out of every three lines, and therefore doesn't suffer so much aliasing.

You can try to blur it in post. That will smear the false colors and false detail, which can help the harsh jagged edges and make the aliases a little less attention-grabbing, but they will still contibute to the image in a negative way

But a more likely solution will be to add an optical filter to the front of the lens that will blur the detail enough to remove the worst aliasing. Hopefully it will only knock your effective resolution down to 720p or so. Jon Fairhurst has already tested several filters, but no one has reporting finding the optimal filter, yet.

Mark Hahn March 9th, 2009 04:27 PM

Quote:

Originally Posted by Daniel Browning (Post 1025051)
There will still be a ton of aliasing even with sharpening down all the way. Presets cannot fix this problem.



One unlikely possibility is to use a camera that does not skip 2 out of every three lines, and therefore doesn't suffer so much aliasing.

You can try to blur it in post. That will smear the false colors and false detail, which can help the harsh jagged edges and make the aliases a little less attention-grabbing, but they will still contibute to the image in a negative way

But a more likely solution will be to add an optical filter to the front of the lens that will blur the detail enough to remove the worst aliasing. Hopefully it will only knock your effective resolution down to 720p or so. Jon Fairhurst has already tested several filters, but no one has reporting finding the optimal filter, yet.

And of course, you can touch-up the obvious ones.

Robert Sanders March 9th, 2009 06:39 PM

Looks like chroma aliasing artifacts to me too. They don't look like deal-breakers though.


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