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-   -   Artifacting with Cineform 4:2:2 (http://www.dvinfo.net/forum/cineform-software-showcase/510392-artifacting-cineform-4-2-2-a.html)

Felix Steinhardt September 2nd, 2012 11:04 AM

Artifacting with Cineform 4:2:2
 
Hi,

Iīm currently setting up my workflow for the Black Magic Camera and Cineform RAW and Iīm running into problems when using the cineform codec to render a master file.

Have a look at those pictures

1. Thatīs RAW. Cineform 4:4:4 looks identical.
http://www.steinhardtverlag.de/Felix/raw.JPG

2. 422. There is strange artifacting at color edges. Like saw teeth. I first thougt, this is the downside of 422 compared to 444.
http://www.steinhardtverlag.de/Felix/422.JPG

3. But pic 3 shows an x264 rendering directly from the raw file. x264 is just 4:2:0 and it looks good. Much less atrifacts than 422.
http://www.steinhardtverlag.de/Felix/x264.JPG

Iīm using Premiere CS5.5 and the current beta version of cineform studio premium.
Whatīs going on ?


Best
Felix

David Newman September 2nd, 2012 01:17 PM

Re: Artifacting with Cineform 4:2:2
 
That is a display artifact not an encoding one. How are you outputing the JPG frames? You might try setting the "Filter 422 to 444" option within the "C" systray icon under "Decoder Settings"

Felix Steinhardt September 2nd, 2012 01:51 PM

Re: Artifacting with Cineform 4:2:2
 
I output a single frame as tiff and then made the crop in photoshop.
I already see the artifacts in the premiere preview when I reimport the clip.

Filter 422 as 444 didnīt help. Hmmm. I have no idea. The files look the same in Sony Vegas I just found out. No Premiere display problem.
I can of course output 444 but itīs unnecessary since a debayered and scaled picture of the BMC is only 4:2:2.

David Newman September 2nd, 2012 02:28 PM

Re: Artifacting with Cineform 4:2:2
 
I will look into why 4:2:2 to 4:4:4 filter is disbled in the 1.3 beta, should be an easy fix. As for 4:2:2 being equivalent because of bayer, that is not completely true, it is somewhere is between 4:2:2 and 4:4:4. Why not post in CineForm RAW?

Felix Steinhardt September 2nd, 2012 02:35 PM

Re: Artifacting with Cineform 4:2:2
 
Quote:

Originally Posted by David Newman (Post 1751081)
Why not post in CineForm RAW?

You mean why not do postproduction in RAW?
I will, I just want to render out a master file to archive or directly play my finished projects in maximum quality.
DNxHD also gives me some artifacts I have no solution for, so I want to use the cineform codec. As far as I know itīs more sophisticated than DNX, too.

But when you say the BMCC is above 422 Iīll render 444 anyway.
Thanks a lot for your help!

David Newman September 3rd, 2012 10:02 AM

Re: Artifacting with Cineform 4:2:2
 
I just fixed the 4:2:2 to 4:4:4 presentation bug. All 4:2:2 encodings are fine.


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