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Strange artefacts

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Philippe Lessard
Strange artefacts
on Nov 5, 2009 at 5:27:15 pm

Hi everybody,

We shot some portrait with the Sony ex-1, and on some sequence whith high contrast have some strange dots appearing, most on straight line.

Here a exemple


Some of you have seen this before

Thanks in advance


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Craig Seeman
Re: Strange artefacts
on Nov 5, 2009 at 5:33:55 pm

A heavily compressed JPEG is hard to use to judge this.
Perhaps turning detail down or off would help.



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Philippe Lessard
Re: Strange artefacts
on Nov 5, 2009 at 6:00:24 pm

Your right, but the dot are very easy to see even on this jpeg.

Here another still.

_full_res.jpg


Thanks



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Craig Seeman
Re: Strange artefacts
on Nov 5, 2009 at 6:08:38 pm

[Philippe Lessard] "Your right, but the dot are very easy to see even on this jpeg. "
Meaningless because JPEG compression results in artifacts. At the very least use uncompressed TIFF files or other uncompressed frame for critical viewing.



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Philippe Lessard
Re: Strange artefacts
on Nov 5, 2009 at 6:34:05 pm

I would, but the upload image have a limit of 500k!
And anyway the problem is clearly visible, the dots around the building straight line are not jpg artifacts, they are on the footage, and i never see that before.
Have you ever see that kind of artifact on EX-1 footage?

Thanks


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Craig Seeman
Re: Strange artefacts
on Nov 5, 2009 at 6:53:32 pm

Those white dots around windows? Never actually.
It almost looks like a "selection" in a photo editing program.
Without knowing whether you had an extreme setting in your picture profile it's hard to make any suggestions other than what I've already made.



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Philippe Lessard
Re: Strange artefacts
on Nov 5, 2009 at 7:30:20 pm

Thanks for the answer,

I am not the cameraman,(im the post-prod man),so I dont know the camera setting/Lens when that was shot; they are shoting at this very time, thats why I want to tell them what wrong before it be to late.Anyway its only on some B-roll...

Thanks


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Dean Sensui
Re: Strange artefacts
on Nov 6, 2009 at 3:18:15 am

I've never seen this happen before.

Do the dots move?

Is it happening in other shots?

You sure the dots aren't objects on the building? :-)

Dean Sensui -- Hawaii Goes Fishing


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Cris McRae
Re: Strange artefacts
on Feb 18, 2010 at 7:07:17 am

the building is possessed. :-o

Thanks
Cris is Bliss
C.I.B. Visual Productions/K3 Films
Rough Luxury Records


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