Check out this busted key – what are we doing wrong?

[Nick Rosier]

I came across this recently – for me I simply had to change the ‘interpret footage’ settings. Nothing to do with keylight as far as I’m aware. Aspect ratio correction?

[Nick Rosier]

Don’t think keylight is the problem here – I had the exact same vertical lines in a piece of footage without any effects applied.

[Travis Turner]

Indeed – thanks for the replies guys, I don’t think it’s a keylight thing either. I’m seeing the same artifacting in keylight as I am in Boris Chroma key – I’ve tried adjusting pixel aspect ratios and switching to 16 bit mode in the project , none of which has worked – so you can see why we’re at a loss

[Philippe Lessard]

For me it’s look like just to be the “toggle pixel aspect ratio correction” preview in after effect, since dvcpro hd is not square pixel you have to use this preview mode to see the proper ratio in after effect on your square pixel computer screen, but is never look good!

Hope this help

[Philippe Lessard]

Sorry, just to be clear, if the toggle aspect ratio correction preview mode is the problem, then you have no problem, just render your comp and it should be ok.

[Philippe Lessard]

First:There a button under your composition window, its a little box with a double tiped arrow over it, click on it, you should see your footage a litte scewed, but with no artifact.

Second:Have you change your footage interpretation? Because your dvcpro hd is not square pixel, but if you have interpreted it square pixel after making a comp by dragging your clip on the make new comp button (on the bottom of the project window), then you have a problem because your comp is not in square pixel but your clip is!I dont know what is your ouput setting, but if you work in dvc pro hd and your output/comp setting is dcvpro hd, you have to use the toggle pixel aspect ratio correction button in order to see your footage in the proper aspect ratio, like i writed it never look good in after effects (its just a preview mode) in any other aspect then square pixel, but you render will be ok.

Hope this help

[Philippe Lessard]

You surely have a wrong aspect ratio, because your talent is scewed horizontaly and your toggle aspect ratio correction button is set to off!Your clip must be scaled or your interpretation footage vs your comp setting is wrong.

Do it from scratch by dragging your footage on the make new comp button at the bottom of the project window, then put keylight on your footage…etc and try the toggle aspect ratio correction button to see what it do.

[Travis Turner]

Yea – we looked into pixel aspect ratio too but that isn’t it either. I’m bringing the clips in square pixel but i’ve tried manually using the DVCpro presets with the 1.33 p.a.r. and that didnt do anything to help – I’m attaching another image to maybe better show what we’re dealing with – it’s this “grid” I’m calling it that’s carving into the key – you can see it best on her shoulders in this shot where there’s about a one pixel series of lines going into her shoulder on the left and extending from it on the right – neither of these markers appear on the unkeyed footage – so strange

[Travis Turner]

We’re actually doing just that. I dragged these clips on to the make comp button to begin with – toggle aspect ratio button doesnt help either – so far its still a mystery

[Philippe Lessard]

Well is maybe just a chroma issue, since you work in dvc pro and dvc pro is 4:1:1, dv is maybe the worst codec for keying!!

Try a chroma blur before keylight with low value, it should help