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Moire effect when downscaling Redepic 4k to HD

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Emil ErikssonMoire effect when downscaling Redepic 4k to HD
by on Apr 2, 2012 at 4:09:34 pm

Hi,

Hope one of you guys can solve this as I'm not a Red guy..

We are going to start to grade a full length feature very soon and all the footage is shot on the Red Epic in Anamorphic 3296x2700.

When I downscale this image to 1920x1080 i get the Moire effect everywhere it's a straight line,
and this does not work well for an entire movie.. This also happens when I try 2k

The way I downscaled it was that I made the online in Nucoda Film master and made a new output which de-anamorphed and downscaled the footage and then I rendered it out as DPX.
(have also tried this in Davinci lite)

In 4k I really can't see this effect at all which will prove I'm doing something wrong:P

So the question would be: How should one properly downscale Red Epic footage to HD?

The reason I'm scaling it down to HD is that we are not going to be needing higher resolution.

Thanks in advanced and cheers!

/Emil


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David BattistellaRe: Moire effect when downscaling Redepic 4k to HD
by on Apr 2, 2012 at 4:23:40 pm

How are you downscaling now and what are you viewing it on?

David

______________________________
The shortest answer is doing.
Lord Herbert
http://vimeo.com/battistella



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Emil ErikssonRe: Moire effect when downscaling Redepic 4k to HD
by on Apr 2, 2012 at 9:03:33 pm

Thanks for the answer!

I'm making an autofit output in nucoda filmmaster which scales it down to 1920x800, i realized I wrote 1920x1080 in my erlier post.

Am I using the wrong ratio perhaps?

I had a guy have go at it in another facility on the quantel pablo and it gave the same result..
I don't know exactly how he did the downscale though.

Which is the common way of downsizing Red Epic it you belive?

Would Redcine X do the trick?

Cheers


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Emil ErikssonRe: Moire effect when downscaling Redepic 4k to HD
by on Apr 2, 2012 at 9:08:55 pm

And I view it in HD on Christie HD3k and cinetal monitor and ecerywhere else I look it's the same.


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David BattistellaRe: Moire effect when downscaling Redepic 4k to HD
by on Apr 2, 2012 at 9:38:41 pm

How were the original DPX files created?

What colour space was used?

I'd run a few tests with short scenes by re-outputting the R3D files to DPX through RCX-PRO.

I would have a close look at the "options" in "software scaling" to make sure you are not sharpening the image on output.

David

______________________________
The shortest answer is doing.
Lord Herbert
http://vimeo.com/battistella



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Emil ErikssonRe: Moire effect when downscaling Redepic 4k to HD
by on Apr 3, 2012 at 12:42:16 am

I'm converting straight from the red files.
The colorspace on the red files are gamma2 and when I convert to DPX my project is setup as RGB.

I tried some different scale options and strangely enough the worst one is "NONE". The one we been recommended to use is the one called ZOM filter.

Thanks for the tip with RCX-PRO, I'll give it a try tomorrow and let you know how it went:)

Cheerios!


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Enge GrayRe: Moire effect when downscaling Redepic 4k to HD
by on Apr 16, 2012 at 10:21:01 am

One thing that may be worth checking is your debayering setting.

Is it set to full or 1/2 premium at least, anything less may give you undesirable results.


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