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Chromatic Aberration correction software


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#1 Werner Klipsch

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Posted 18 July 2007 - 11:39 PM

In the now closed thread "Is this a good lens", some people told me that my idea for chromatic
aberration-cancelling software to post-correct cheap lenses is already in use by manufacturers.

However I cannot find any references to this system anywhere, aside from some very
specialist equipment used for etching silicon microchips.

Can someone kindly direct me to a suitable source of information?
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#2 Will Earl

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Posted 19 July 2007 - 01:44 AM

These links seemed like the most relevant to what your after.

http://www.photos-of...cles/adobe-raw/
http://www.erik-krau...index.htm?./ca/
http://hugin.sourcef...ls/tca/en.shtml

Hope that helps.
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#3 Werner Klipsch

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Posted 19 July 2007 - 04:22 AM

These links seemed like the most relevant to what your after.

http://www.photos-of...cles/adobe-raw/
http://www.erik-krau...index.htm?./ca/
http://hugin.sourcef...ls/tca/en.shtml

Hope that helps.

Thank you, but that is not really what I was thinking of.

The idea is that you calibrate the de-aberrator for that lens ahead of time by pointing the camera at a monochrome test chart and letting the automated software work out a correction profile. Once it has worked out how to do it on a black and white test chart , the same correction should then work applied to actual movies shot with the lens. A really advanced system would have a motorized lens controller so that the lens could be calibrated with different iris settings which would be remembered by the calibrator.

I anticipate you would do this as part of the camera test procedure prior to shooting, once for each lens and then tell REDCODE which one you used to shoot a particular shot. Or with the advanced system, it would already know the lens used and how its iris was set and so on.
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#4 Stephen Williams

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Posted 19 July 2007 - 05:13 AM

Thank you, but that is not really what I was thinking of.

The idea is that you calibrate the de-aberrator for that lens ahead of time by pointing the camera at a monochrome test chart and letting the automated software work out a correction profile. Once it has worked out how to do it on a black and white test chart , the same correction should then work applied to actual movies shot with the lens. A really advanced system would have a motorized lens controller so that the lens could be calibrated with different iris settings which would be remembered by the calibrator.

I anticipate you would do this as part of the camera test procedure prior to shooting, once for each lens and then tell REDCODE which one you used to shoot a particular shot. Or with the advanced system, it would already know the lens used and how its iris was set and so on.


Hi,

Focus is very important, as far as CA is concerned. Trouble is beautiful bokeh may get lost or corrected.

Stephen
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#5 Mitch Gross

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Posted 19 July 2007 - 10:40 AM

Look into the new Panasonic HPX500 and the upcoming Panasonic HPX3000. They have the CAC (chromatic abberation correction) for specific lenses with preset files. I have seen it in action and can testify that it does work quite well.
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#6 Werner Klipsch

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Posted 20 July 2007 - 04:57 AM

They have the CAC (chromatic abberation correction) for specific lenses with preset files. I have seen it in action and can testify that it does work quite well.

Thank you. Actually, one of the original posters called it "CRC". No wonder I couldn't find it.

It does somewhat sound like one of those solutions that may be worse than the problem! Still all information is good information. Even information one does not care to hear!

I think Jannard is going to have to make his lenses good the old fashioned way.

And that IS chromatic abberation on the picture I posted.
Or is this not a thing: Here they suppose I manage to produce a perfect replica of CA by only resampling of a JPEG still from the REDUSER site, yet, I cannot do the same thing with endless resample generations of a similar image from my own camera. Bah! Humbag!

Still I suppose rattling the cage on the Red Bull powered sideshow is somewhat un-christian of me.

So it is a good thing I don't believe in that sort of thing. :rolleyes:
But the bad thing is, I can't sincerely tell people to go to hell either :D:
One cannot win.

We wait.........

Focus is very important, as far as CA is concerned. Trouble is beautiful bokeh may get lost or corrected.


Just so, but in theory all that is happening is that the software slightly distorts the image by the same amount it did to correct the test card. There was no intention that the system analyse the taken image in any way. So it should just make the cheap lens behave like the expensive one, bokeh and all.
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