[Travis Dao]

Yes I searched online I just wanted to check with the CC experts… so these results are normal? Does the GFX card help with exporting speed or does it just speed-up timeline editing and rendering? Is there any way to verify that the Mercury Engine is working correctly — the render bars turn from red to yellow when I switch it on but the CPU usage appears to be the same.

Thanks,
TD

[Travis Dao]

That is a very cool trick. Thanks!

TD

[Travis Dao]

I think the shot was well lit and the distance between subject and background was adequate. The three shades of green is the main problem. It was recorded in DVCPro HD is that a good codec for keying?

Thanks,
TD

[Travis Dao]

This sounds like a good suggestion. To clean up the spill do you mean to use spill suppressor? I played around with screen gain/balance in Keylight and got some decent results.

Thanks,
TD

[Travis Dao]

There are three shades of green behind him and the video is about an hour long. I don’t really want to animate masks or rotoscope for the full hour. I thought I could key out each shade of green and use that as luma matte but he ends up greenish.

Thanks for the advice,
TD

[Travis Dao]

There’s a grid behind him with two shades of green and then his lower half is in front a third shade of green. I tried keying out each shade of green separately, pre-comping those layers, then luma matting it with the original footage but he looked greenish. My current work-around is to adjust the key so there are no white artifacts (but i lose some of his face) then do a separate key on his head and mask that over. Probably not the most elegant solution but the video is an hour long and I really don’t want to rotoscope it!

This is probably a no brainer but I guess I should lose the grid next time we tape.

Thanks for your help.
TD

[Travis Dao]

You’re right it is one of the screen settings. I reset the other values and it came down to screen pre-blur and the clip black settings as the culprits. I can lose the white artifacts but then I lose some of the person. He’s standing in front of a grid with two shades of green (unfortunately there was nothing I could have done about it). That’s probably what’s causing me these issues with the key. How would you go about keying someone in front of two shades of green?

Thanks for your help you’ve really helped me along.

TD

[Travis Dao]

Funny you say that I was playing with that setting when you responded. It’s already set to 0.0 unfortunately I can’t set negative values. If I increase it a gray band extends from his groin. Do you know of any other way I can remove it?

Thanks,
TD

[Travis Dao]

I tried using Intermediate Result but it just changes the white artifact a little green. I’ve attached a screen shot of what I’m seeing.

4959_whiteartifacts.png.zip

I put the person on a red background so you can see the white artifacts near his groin and where his arms meet his body.

Thanks,
TD

[Travis Dao]

Thanks for the response.

I tried untoggling the “Unpremultiply Result” checkbox but nothing changed.

Do you mean to adjust my Keylight values to the “Intermediate Result” and use that as the key?

I wonder if there is an issue using DVCPro HD keying with my computer. It’s strange that the key would cause white artifacts just around the legs and arms. I did a search on the internet and couldn’t find anyone else posting the same problem.

Thanks,
TD