improve edges, keying

[Kevin Camp]

did you deinterlace your dv before keying? fields (if left in) will create bad edge behavior when keying/compositing.

Kevin Camp
Designer – KCPQ, KMYQ & KRCW

[Brendan Coots]

DV is a notorious pain to key. The reason is that DV has very poor color information. To see this, temporarily disable your key and set your composition viewer window to only show the green or blue color channels.

A trick that helps is to separate out the YUV channels and slightly blur the just the color channels, which results in a cleaner edge for your keyer to work with:

1. Convert your RGB footage to YUV using the effect “Channel Combiner”
2. Apply the “Channel blur” effect to the U and V channels, 2-4 pixels of blur
3. Apply “Channel Combiner” again and use it convert the footage back from YUV to RGB

An easier method is to use DVMatte (https://www.dvgarage.com/prod/prod.php?prod=dvmatteb), a $99 greenscreen keyer specifically designed for keying DV. It works great and does the same thing I outlined above.

Brendan Coots
Splitvision Digital
http://www.splitvisiondigital.com

[Whaaaaat]

well, first i used keylight i messed around with the screen matte settings: output black/white. Put screengain to 110 i think. And i auto traced it. Hope thats enough info

I also tried to key this footage with premiere pro 2 and used all kinda stuff like offcourse chromakey,greenscreen key, roughen edges, levels and some more. But with AE i get slightly better results.

I can accept the bad quality picture but the edges are killing me, the pic needs to stay still if you know what i mean.

[Kevin Camp]

in ae7 (and probably cs3) there is a ‘reduce dv blockiness’ preset that will apply those effects and settings in one step…. if you prefer.

you might also check barend’s keying/matte tutorial.

Kevin Camp
Designer – KCPQ, KMYQ & KRCW

[Whaaaaat]

Thanx guys i’ll try the suggestions u all made and post some results later on.

[Whaaaaat]

I played around with the suggestions you all made and i think i came up with some better results.I haven’t color corrected this yet to the background but that doesn’t really matter.

Settings pic https://www.henksportfolio.nl/tests/results.jpg
Movie: https://www.henksportfolio.nl/tests/robbert.mov (its a very big file 15mb, sorry bout that)

I do think it looks good now but any other suggestions to improve this are more then welcome off course

[Josh J. johnson]

IS dv matte only for motion?

[Brendan Coots]

No it works with FCP and After Effects, their page is a bit misleading.

Brendan Coots
Splitvision Digital
http://www.splitvisiondigital.com