Here is a frame from a recent green screen work i did, shot with a GY-HD100. The reason i chose this footage is because it will make it easier to see the 4:2:0 colour compression.
Let's see the RED CHANNEL (magnified 4 times from original frame size). The colour artifacts are visible, especially along the hat's edge.
Now, let's see what the Deartifacting tool does...
The improvement is easily noticeable. The algorithm filled all the missing colour information and fixed HDV's compression artifacts.
Now, let's see what the Chroma Blur tool does. (The NLE used for both tools was VEGAS 7.0b)
It is clear that although the colour artifacts were smoothed out we created a new problem to the footage. We created colour bleeds and that means that we lost the footage's colour sharpness.
Compared with how bad 4:2:0 artifacts can be for your footage you might say that a little loss of colour sharpness is not such a big sacrifice, but if your aim is to produce the best possible image from HDV compressed footage then Magic Bullet's deartifacting tool is the better choice...
7 comments:
Thanks. I found it very useful.
Yes, great test. That has cleared up the issue for me. I have just done a MB Deartifacting run and the test of yours confirms that although it takes longer, is better for the final look of your footage.
Thx Geoffrey
nice...
but is it a chroma blur based upon an edge detect matte? so the blur is kept tightly on the edges. like how you would do a degrain? (http://miafx.com/23/tiki-index.php?page_ref_id=279)
Hey mrrafs, good to see you here.
The chroma blur tool tested is the generic tool that most NLE software have.
The technique you describe although very powerful, is very difficult to emulate out of a compositing software (like our Fusion).
Besides, even when the chroma blur is applied under such a controlled situation i am sure it will not be as good as the de-artifacting algorithm.
It's just more than a blur.
Excellent, thanks for posting this!
Just one question, is the deartifacting a part of the Magic Bullet movie looks pack that comes with Vegas 7, or does it only come with the Magic Bullet Editors plugin that you need to buy?
:-)
...Need to Buy!
Thank you. It is always a pleasure to learn from you, Director.
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