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#1 |
Major Player
Join Date: Dec 2007
Location: Hertfordshire UK
Posts: 414
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Chromatic aberration
Does anyone know how to get rid of it? Im using an iscorama 54 anamorphic adapter on an EX-1 and noticing a degree of colour fringing sometimes that just doesn't happen on the EX-1s amazing lens. Just wondered if anyone knew of a program to get rid of this?
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#2 |
Inner Circle
Join Date: Mar 2003
Location: Billericay, England UK
Posts: 4,711
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Iscorama 54 huh? So you're shooting 2.66:1 movies. Great! The punch of that is probably worth having some fringing on board.
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#3 |
Major Player
Join Date: Dec 2007
Location: Hertfordshire UK
Posts: 414
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Agree Tom!
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#4 |
Major Player
Join Date: Mar 2005
Location: canterbury
Posts: 411
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Mark,
It depends on the type of aberration. You might be able to run the footage through after effects and scale the RGB channels differently if it's a simple type of fringing. Other things you can do is to key the fringe colours and desaturate them, sometimes this can work, it really depends on the type of footage. I'd love to see a frame. What's the resolution like through that adaptor? cheers paul |
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#5 |
Major Player
Join Date: Dec 2007
Location: Hertfordshire UK
Posts: 414
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Hi Paul
This is without the anamorph http://www.freewebs.com/markwilliams/without.png And this is with http://www.freewebs.com/markwilliams/Anamorph.png |
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#6 |
Inner Circle
Join Date: Mar 2003
Location: Billericay, England UK
Posts: 4,711
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Oh dear - I see what you mean. Almost better to mask down the original frame rather than have to accept wooshy edges like that.
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#7 |
Major Player
Join Date: Mar 2005
Location: canterbury
Posts: 411
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I was about to say something similar. i thought the lens would give you a much wider fov. In this case you'd get better results cropping the original down as Tom says.
Is the adaptor meant for 4:3 cameras perhaps? Having said that you could squeeze the channels horizontally (try expanding the red a little bit widthwise, 100.25%), i think it would clear it up a bit. Or run it through a photographic (RAW converter) style defringer. cheers paul |
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#9 |
Major Player
Join Date: Dec 2007
Location: Hertfordshire UK
Posts: 414
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Bill I was just thinking about you! I was using your picture profile when I took it. This is with Picture profiles off
http://www.freewebs.com/markwilliams...20pp%20off.png |
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#10 |
Regular Crew
Join Date: Feb 2008
Location: Finland
Posts: 25
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Err, having looked at the pictures; donīt really know which way to take this. Better without?
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#11 |
Major Player
Join Date: Dec 2007
Location: Hertfordshire UK
Posts: 414
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Mika I would say no difference with PP on or off. I just thought people might like to see nd judge for themselvves. Bill I've found the plugin and downloaded virtual dub. Imported the picture and added the filter. However I cant see the effect in the preview screen? When I do get a preview screen its zoomed in so much cant see a lot?
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#12 |
Major Player
Join Date: Dec 2007
Location: Hertfordshire UK
Posts: 414
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I would guess though whatever I do Im not going to get rid of this! Im surprised virtual dub has a tool like this and after effects doesn't.
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#13 |
Major Player
Join Date: Dec 2007
Location: Hertfordshire UK
Posts: 414
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I wonder if I moved the iscorama forward a bit? I'll try that tommorow.
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#14 |
Regular Crew
Join Date: Feb 2008
Location: Finland
Posts: 25
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I guess you could get away with it quite simply by forgetting about the anamorphic adaptor, having framing guidelines in your monitor/viewfinder and cropping afterwards. I donīt know if itīs possible to define a box cursor to the ex, hardly so.
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#15 |
The PP settings won't be the cause of CA.(doncha just love acronyms?)
But, my question to you is what aperture settings did you use on the shot with and without CA. CA, in hi quality optics, is made worse by long zooms and apertures too far from the sweet spot. If you were shooting down around f/8 or less, this would be my guess. Also, how does the adapter mount to the cam lens? If it's tilted, even slightly, relative to the lens axis, you could induce CA. |
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