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Unintended Posterization effect

Posted: Sun, 22nd Feb 2009, 11:13am

Post 1 of 9

nw316

Force: 800 | Joined: 29th May 2008 | Posts: 20

CompositeLab Pro User EffectsLab Pro User

Gold Member

Hi
I'm experiencing problems of posterization looking effects after rendering. Anyone help me on this. I read something regarding this I think somewhere relating to an image with too much sharpness, however the image 'm using is significantly blurred.

Thanks ,
Don
Posted: Sun, 22nd Feb 2009, 11:26am

Post 2 of 9

Arktic

Force: 9977 | Joined: 10th Nov 2003 | Posts: 2785

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SuperUser

Hi - could you give a us a bit more info?

What program are you using? What effects are you adding? Can you post an example image of the problem?

Cheers,
Arktic.
Posted: Sun, 22nd Feb 2009, 4:00pm

Post 3 of 9

pdrg

Force: 5405 | Joined: 4th Dec 2006 | Posts: 4143

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Pure guesswork here, but are you MPEG compressing at too high a ratio? It would explain a loss of resolution and blockiness/banding if that's what you're suffering. Post some examples and/or try increasing the bitrate for the encoding if it's going out to an MPEG/MJPEG format.
Posted: Mon, 23rd Feb 2009, 12:17am

Post 4 of 9

nw316

Force: 800 | Joined: 29th May 2008 | Posts: 20

CompositeLab Pro User EffectsLab Pro User

Gold Member

I am using Composite Lab I purchased last year. The files were created in Adobe Premiere as .avi files, imported directly into Composite Lab. I am using the green key color difference effect, and the posterization occurs on my background layers.
Posted: Mon, 23rd Feb 2009, 12:30am

Post 5 of 9

Arktic

Force: 9977 | Joined: 10th Nov 2003 | Posts: 2785

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SuperUser

I've moved this thread to the apropriate forum (the CompositeLab help section) smile

Any chance you could upload a still image of the problem?

Cheers,
Arktic.
Posted: Mon, 23rd Feb 2009, 10:23am

Post 6 of 9

Simon K Jones

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FXhome Team Member

What render settings are you using? Do you see the problem when you're working on the project inside CompositeLab?
Posted: Mon, 23rd Feb 2009, 11:08pm

Post 7 of 9

nw316

Force: 800 | Joined: 29th May 2008 | Posts: 20

CompositeLab Pro User EffectsLab Pro User

Gold Member

Currently I don't see the problem in CompLab, only after rendering. I am rendering multi layer, QuickTime format. One thing to note, I discovered it is happening on backdrops I apply a blur filter on , i.e. zoom blur.
Posted: Mon, 23rd Feb 2009, 11:11pm

Post 8 of 9

nw316

Force: 800 | Joined: 29th May 2008 | Posts: 20

CompositeLab Pro User EffectsLab Pro User

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Also, I rendered with Compression type : Video and Quality: Best
Posted: Mon, 23rd Feb 2009, 11:44pm

Post 9 of 9

nw316

Force: 800 | Joined: 29th May 2008 | Posts: 20

CompositeLab Pro User EffectsLab Pro User

Gold Member

Appears it was the render settings - I switched to DV NTSC and also 16:9 which was the source format and all is well. Thanks for your help. Any great tutorials on maximizing green screen keying?