SONY CINEALTA:

Sony CineAlta HD Forum

HDV Format Forum

Sony CineAlta HD Articles

Strange artefacts


	Cow Forums : Sony EX Series XDCAM << PREVIOUS THREAD • VIEW ALL THREADS • PRINT • NEXT THREAD >>

Strange artefacts
by Philippe Lessard 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

Respond to this post • Return to posts index

Re: Strange artefacts
by Craig Seeman 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.

Respond to this post • Return to posts index

Re: Strange artefacts
by Philippe Lessard 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

Respond to this post • Return to posts index

Re: Strange artefacts
by Craig Seeman 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.

Respond to this post • Return to posts index

Re: Strange artefacts
by Philippe Lessard 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

Respond to this post • Return to posts index

Re: Strange artefacts
by Craig Seeman 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.

Respond to this post • Return to posts index

Re: Strange artefacts
by Philippe Lessard 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

Respond to this post • Return to posts index

Re: Strange artefacts
by Dean Sensui 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

Respond to this post • Return to posts index


	<< PREVIOUS THREAD • VIEW ALL THREADS • PRINT • NEXT THREAD >>