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Posterization blues

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Hugh John MurrayPosterization blues
by on Apr 30, 2010 at 10:18:20 pm

Hallo! Working with some footage from a 7D for a project and have noticed there is posterization in shots of the sky due to colour gradation. Is there a way to smooth this out? Any ideas? Plugins, work arounds?

Many thanks


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Chris WrightRe: Posterization blues
by on Apr 30, 2010 at 10:41:00 pm

first make sure that you are running 32bpc, have color management setup correctly, are using 32bpc plugins, etc.

Next you can either use a chroma keyer or use procedural matting to isolate the blue tolerance to the blue saturation then a simple fast blur.

I recommend Primatte keyer because it can plug holes which is useful for automatic roto work. If you don't have it, you can use my free procedural keyer I made. Works on clouds too.

Here's my AE cs3 procedural keyer for luma/sat.
use matte adj controls layer to create a procedural matte keyer using the inner/outer sliders
http://www.megaupload.com/?d=DYVXXNIW


http://technicolorsoftware.hostzi.com/


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Hugh John MurrayRe: Posterization blues
by on Apr 30, 2010 at 11:03:56 pm

sweeeet. will try it, thanks. don't suppose it makes a difference if there is a big plane moving through the sky or subject in foreground?

cheers


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Chris WrightRe: Posterization blues
by on Apr 30, 2010 at 11:18:33 pm

I don't think the plane will be a problem or the subject as long as they are not blue, but make sure you click the link I updated, not the email. Also the comp size was 720. And if the person is wearing a blue shirt, you still might have to roto. Cotten shirts tend to encompass the entire blue range/sat...evil they are.


http://www.megaupload.com/?d=DYVXXNIW


http://technicolorsoftware.hostzi.com/


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Hugh John MurrayRe: Posterization blues
by on May 1, 2010 at 4:14:51 am

on second look and playing with your aep, I fear this is beyond my AE skillset. Really have no idea what to do. Was hoping for an easy plug-in - but thanks anyways!


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Roland R. KahlenbergRe: Posterization blues
by on May 1, 2010 at 12:51:15 pm

Try Channel Blur on only one of the RGB channels - I can't recall which ;-). It works quite well on different conditions.

Cheers
RoRK

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