Artifacts on Rendered Footage

[henriquered]

Hello,
We have recently just started testing with a REDOne camera. Very happy with the results so far- except when rendering one from the RED Raw file to DPX/Tiff image sequence we are noticing an artifact in the picture and our guess is that this is due to how the information is getting put back together in the rendering program- please see pictures linked to this post for reference. I have been using mostly REDAlert which has more rendering options than REDCine. Basically our footage is 4K 2:1, we are shooting a subject over a green screen outdoors on a sunny day. I have tried different rendering options on REDAlert but the artifact are still there. We were thinking the debayer was the first thing to look into- but that didnt solve the issue yet. I will continue testing different options- but I wanted to post this here to see if anybody had any thoughts.

The images you see linked to this post are blown up substantially- but the point is that these artifacts should not be present the way they are in the picture to begin with.

Thanks in advance,
- Henrique

http://www.brickyardvfx.com/screengrab1.jpg

http://www.brickyardvfx.com/screengrab2.jpg

http://www.brickyardvfx.com/screengrab3.jpg

 

[Greg M]

What FW build are you using on the camera?

 

[henriquered]

Hi, We are using build 3.2.5- also the latest versions of REDAlert & REDCine.

 

[Greg M]

Hi, We are using build 3.2.5- also the latest versions of REDAlert & REDCine.

but in the camera...is it the latest build 16, or build 15?

 

[henriquered]

16- the latest one.

 

[Greg M]

not sure then, I am not seeing this on footage I recently shoot on green screen w B16. Can you detail exactly how you are processing the footage.

 

[henriquered]

Was this a known problem on build 15?? What do you think is causing the problem?
We are just opening the .R3D file on CineAlert and exporting it out of there. Like I said I have been trying different options- but the one that made the most sense were:

http://www.brickyardvfx.com/redalert1.jpg

http://www.brickyardvfx.com/redalert2.jpg

Thanks for the help, by the way.

 

[I Bloom]

Turn OLPF compensation off.

Hope that helps.

IBloom

 

[Kjetil Haugen]

I'm also in the guessing business when it comes to these export settings as there's little information about that. Looking at your settings I wonder if the problem might be that you're trying to both soften the image with heavy denoise and at the same time sharpen with heavy olpf compensation and high debayer detail.
Have you tried a softer resample filter aswell? The catmulrom is labeled sharp.
In short... lots and lots of sharpening going on here and the problem seems to be with the edges, hence I'm guessing that might be the problem. Emphasis on guessing here
Try an export with all settings set to the softest alternative and see what you get. If you havn't already...

 

[Greg M]

try lowering the settings to medium or lower. I usually dont set them that high.
We also export REC709

 

[Harry Capota]

that's to much detail enhancement, pal!

 

[Jance Allen]

Looks like sharpening artifacts. Isn't the OLPF Compensation similar to sharpen? I'd try lowering that and maybe lowering detail too. You can always sharpen at the end after you've pulled a much nicer key.

 

[henriquered]

Thanks for the suggestions guys- I definitely see an improvement. I will keep testing different combinations and see what will come out with the best result.