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How can i avoid creating noise when keying or colour grading?
Gday guys
I have been doing alot of keying with the keylight filter of late… and notice that when ever i switch to the final view, it introduces alot of noise into the picture. So i then use other filters to colour grade. However, this also introduces noise into the scene.
Why does colour grading introduce noise?
My source material is Digital Betacam. Its captured using an Avid Composer. We then export the necessary vision using QT Animation, and this is the footage that we use.
I use 16bit AE projects for all grading and key work.
We then export again as a QT Animation file, and import at 2:1 into the Avid.
I just dont yet know enough about the pipeline/workflow above. Im wondering if i need a better codec like Microcosm to export out of. Is there some YUV-RGB conversion going on when i export from the Avid and Back again.
Can anybody else give me a better workflow. (nb. the editors have access to a Unity Drive where all the vision is stored, however we do not have anymore licenses, and thus can not get access to these files, hence why we are exporting as a QT)
Cheers
Chris -
3 Replies
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Well, few notes. Yes coming out of Avid you are most certainly YUV which is converted either to RGB when it’s saved to Animation codec (RGB) or if nothing else when it enters AE (All RGB). The Animation codec is 8 bit so if you worked in 16 internally and rendered back out to Animation, you are introducing banding. But It appears you are speaking of noise and not banding, yes?
Are you sure it is noise and not interlacing artifacts, or compression problems, or banding or other? So it looks like if you bumped the gain switch on that betacam gain type noise?
Chris Smith
https://www.sugarfilmproduction.com -
Hey guys
ITs definately noise, because i can see it when i ram preview out of AE. The faces on the talent, their clothes are all noisey and looks cheap.
My matt key is fine when coming out of keylight too. No grey areas.
Cheers
Chris -
Hi Dave
No Im not. Im using just regular colour effects, like the levels, curves, hue/sat, blur, and blending modes.
I just don’t understand how noise is introduced.
The original looks clean (without noise), however it has been pointed out that QT Animation is only 8 bit. So maybe i have to look at higher bit codecs like Microcosm
Cheers
Chris
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