Help!! Serious artifacting!

[Yean Loon]

Hi guys,

take a look at this clip shot 4K 16:9. I've tried every possible combination of settings in Red Alert! The aliasing/banding in the blacks is killing me!

Any solutions?

yean

http://www.flowerchildprojekts.com/yean/test.mov

 

[Gunleik Groven]

Downloading, but in the meantime:

I've seen monitor-related banding, could that be it?

To what format are you developing the files?

Please describe the exact steps you used to get this result.

Gunleik

 

[Ed Watkins]

That is some nasty artifacting, I've never had anything like that.
Please outline the steps you are taking, and the settings you are applying.
Also, what codec you are exporting to.

 

[Yean Loon]

Downloading, but in the meantime:

I've seen monitor-related banding, could that be it?

To what format are you developing the files?

Please describe the exact steps you used to get this result.

Gunleik

I'm using Red Alert. Half Debayer to DnxHD. Scaled down to 1920 x 1080. I've tried ALL the resample filters.

The current file i've posted is in H.264. For file size purposes. It looks a touch better in DnxHD

thanks Gunleik

 

[Matthew Rogers]

That just looks like H264 8 bit banding. Are you getting the same thing when you export to ProRes? What about if you export a tiff?

Matthew

 

[Evin Grant]

You need to crush your blacks my friend. Redcode sets it's shadows above the noise floor to maintain the most detail. You need to crush it back down before you export.

 

[Yean Loon]

That just looks like H264 8 bit banding. Are you getting the same thing when you export to ProRes? What about if you export a tiff?

Matthew

Here's a 2K tiff. Everytime i try to crush the blacks, it increases the artifacts.

http://www.flowerchildprojekts.com/yean/test.tiff

Just did another test with prores. it was clean!!! it could be the DnxHD codec then.

Eternally grateful to you guys. Now i gotta convince the director to cut on FCP.....

cheers,

yean

 

[Simon Blackledge]

Try a small portion to an uncompressed QT first. AJA 10bit 444 etc.. if thats fine blame the codec.
s

 

[Gunleik Groven]

There's frankly a lot of issues here...

Could you export 1 single tiff (16 bit) as REDlog, set asa to 200 and kelvin to 5000?

Pretty please?

 

[Yean Loon]

Oh no.... the prores clip still had the artifacting! i was fitting the clip to screen and there was no artifacting. in its actual resolution/size, the 'uglies' were still there!!! sigh...

help??

 

[Gunleik Groven]

Can you export a Tiff as I said.

Don't change any other controlls..

 

[Yean Loon]

2k tiff

http://www.flowerchildprojekts.com/yean/test.tiff

 

[Yean Loon]

i found that the more i crush the blacks....i can get to a level where the artifacting disappears...but its a bit extreme....

 

[Yean Loon]

http://www.flowerchildprojekts.com/yean/2K Half crushed.tiff

http://www.flowerchildprojekts.com/yean/2K Original.tiff

http://www.flowerchildprojekts.com/yean/2K Very crushed.tiff

you can't see the artifacting from the tiffs....

 

[Simon Blackledge]

http://www.flowerchildprojekts.com/yean/2K Half crushed.tiff

http://www.flowerchildprojekts.com/yean/2K Original.tiff

http://www.flowerchildprojekts.com/yean/2K Very crushed.tiff

you can't see the artifacting from the tiffs....

Then its your transcode to a compressed codec.

Did you shoot 2k or 4k?

 

[Yean Loon]

it was 4K 16:9....redcode36

there's also some artifactin when i render out uncompressed quicktime...but very minimal

 

[Simon Blackledge]

What area of the picture are you seeing artifacts?

Have you got all settings to FULL Quality ?

Ok.. get that Uncompressed clip, load into quicktime and export as ProResHQ. Does the banding come back?

 

[Yean Loon]

did that....clips are almost identical....banding still there..

i'm in RedAlert...half debayer..scaled to 1920 x 1080....catmulrom resample filter

 

[Esteban Sosnitsky]

Full debayer is a MUST all the time. Select a less sharp resample filter. Crush your blacks.

 

[Yean Loon]

Full debayer is a MUST all the time. Select a less sharp resample filter. Crush your blacks.

ok..i'll try that now...thanks