Moire…….i think?

VEGAS Pro

Moire…….i think?

Posted by Martin Stanesby on February 27, 2015 at 8:46 pm

Hi,
Can anyone tell me first off how I got jagged lines on a still object straight edge, with no camera movement against a white background? I’ve managed to upload a still snapshot of it. It’s the horizontal edge, not the vertical edge.

And is there a way I can get rid of it in Vegas?

Thanks

Martin

Michael Gissing replied 11 years, 2 months ago 6 Members · 13 Replies
13 Replies

Ryan Mcrobb
February 28, 2015 at 10:47 am

Did you intend to upload a video for us to see?
If so, I can’t see it.

For what it’s worth, I used a NewBlue plugin(the name escapes me) once to add a very slight blur using a mask, unto the checked shirt of an interviewee I once shot, which worked really well.

http://www.ryanmcrobb.com

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Martin Stanesby
February 28, 2015 at 11:06 am

Hi Ryan,
Thanks for the response. For some reason it won’t let me upload my mp4 file. It’s only a 4 second clip of a static shot with no movement at all. It’s of a clothes rail, so all straight edges.
I used lighting and a white backdrop. It seems this made the image so clear that the dslr just couldn’t handle it so the top horizontal bar has gone all jagged….jjust like when you blow a picture up that hasn’t got enough pixels. It’s horrid.

Unfortunately any kind of blurring doesn’t work here as it stands out too much as though the shot is out of focus.
I can’t believe this is an issue with no fix or preventative??
I used a Canon 6D. I do believe it is sharper than the 5D sensor which may be the problem, but I knock the sharpness way down to only one notch….mmy be the one notch is too much also.

Does Neat Video plugins for Vegas work for this problem?

Thanks

Martin
Bob Peterson
February 28, 2015 at 4:33 pm

Another possible explanation is chromatic aberration which is caused by the camera lens. However, without an image to see what you are talking about, we can only speculate. If a problem originates within the camera, it becomes much harder to overcome.
Martin Stanesby
March 1, 2015 at 9:33 am

Hi Bob,
Thanks for your response.

I have now managed to upload a still of the problem.

What’s baffled me is that I used two Canon 6D’s with different lenses, using different F stops from 1.4 up to 11….and they all have some of this problem. Incidentally, the close up images don’t have it but this wider shots have it worse.

Is it cause by the white background to bright, or not enough light? Too much light bring out the sharp detail?

How can a void this because this isn’t good enough.

Thanks
Martin
Warren Eig
March 1, 2015 at 5:56 pm

If you take a still image in RAW do you get the same stair stepping? If not then it is H.264 compression in the video. I see the highlights at the top and it looks like compression artifact.

That’s just my best guess.

Warren Eig
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Martin Stanesby
March 1, 2015 at 8:42 pm

Hi Warren,
Thanks for your response.
I’m not sure about that. The original .mov files from the Canon 6D have this distortion. I don’t know what you mean about h.264 compression?

Please could you explain for me.

Thanks
martin
Bob Peterson
March 1, 2015 at 9:16 pm

In my opinion, that is chromatic aberration (also known as color fringing). It is not unusual, and is essentially a defect or limitation of the lens. Changing apertures will not help. Getting closer so that everything is enlarged will help. Yes, I have seen it in my photos where there is a strong backlight which creates a high contrast situation, and fairly well defined edges. There are many discussions of this on the internet. Here is one on Wikipedia;

en.wikipedia.org/wiki/Chromatic_aberration

I think you said you used a couple of lenses. Specifically, which ones? High quality lenses, “L” class or better for Canon, should reduce this problem substantially. Photoshop CS6 has the ability to reduce chromatic aberration within its raw format processor. I am not aware of anything like that for video.
Martin Stanesby
March 1, 2015 at 9:24 pm

Hi Bob,
Yes I’ve read a few articles on chromatic abberation, none seem to have the jaggies. Photo shop and the likes I see can reduce the colour fringing but when you have jagged distorted lines this can’t be rectified with that.
Admittedly my lenses are not top L class Canon, but Tamron.

Thanks
martin
Bob Peterson
March 1, 2015 at 9:58 pm

OK, Tamron is the problem, and, yes, I think the jaggies you are seeing are part of the chromatic aberration. When a lens is not perfectly focused, it will produce this sort of distortion. As the article noted, reducing the contrast is one way to reduce the problem. A different background color should also help although some colors will work better than others.

One other thing to think about is the importance of the problem. I have noticed that many glitches that you can see in an image will not be noticed in a video. People will simply not see many of the things that you do because the image is changing quickly and we tend to sit much farther away from the screen.
Martin Stanesby
March 2, 2015 at 10:32 am

Hi Bob,
Thanks for the pointers.

so, if a stop down as far as I can go, focus is sort on then I shouldn’t have this problem?
Do you think the brighter the lighting on the white the more it would bring out the contrast on the edges? I would consider reducing the lighting and brighten, or mask out in post.

That’s an interesting point you mention about glitches in video. I think if this wasn’t a still shot then it wouldn’t stand out so much. However, sometimes when the image is moving it can highlight it as there’s movement around the jaggies.

Thanks
Martin

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