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Chromanator edge wiggling

Posted: Mon, 15th Mar 2004, 4:06pm

Post 1 of 11

MarkB

Force: 220 | Joined: 7th Mar 2004 | Posts: 47

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I'm having a problem with bluescreening. It works ok, but I get a shimmery effect right at the edges.

I've uploaded some samples. The "front" is at: http://www.markbsplace.net/front-divx.avi (200k)

The "back" is at: http://www.markbsplace.net/back-divx.avi (2mb)

and here is my result using Chromanator. http://www.markbsplace.net/test-divx.avi (200k)

Notice in the background up high (above the figure) how the edge of the window where the bluescreening is occuring is all shimmery wiggly (is that a technical term?)

Can anyone explain what I am doing wrong?

Mark
Posted: Mon, 15th Mar 2004, 4:10pm

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Simon K Jones

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FXhome Team Member

I presume the files you are actually working with aren't divx, and are something high quality like DV?
Posted: Mon, 15th Mar 2004, 4:12pm

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Joshua Davies

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Well the first problem is that you are using blue rather than green which will work much better. Also as Tarn said, divx isn't a good editing format at all but I doubt you are using divx.
Posted: Mon, 15th Mar 2004, 4:13pm

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MarkB

Force: 220 | Joined: 7th Mar 2004 | Posts: 47

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Sorry - the source files are uncompressed RGB. I didn't post them due to the size, but when I play them in media player they look on the screen just like the divx ones I created. Do you want to see one of them?
Posted: Mon, 15th Mar 2004, 4:14pm

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Joshua Davies

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Try greenscreen, blue is about the worst background you can using with DV equipment.

In the next release you could just make a simple garbage matte for something like this...
Posted: Mon, 15th Mar 2004, 4:22pm

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MarkB

Force: 220 | Joined: 7th Mar 2004 | Posts: 47

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I didn't think a garbage matte would work as the figure is walking in front of the window area.

So is "blue" basically unworkable as a color or if I brightened it up or upped the saturation or something would it work?

Mark
Posted: Mon, 15th Mar 2004, 4:31pm

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Simon K Jones

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I just did a little test with the files you uploaded and seemed to get a pretty good key on it. There was a slight fringing around the top part of the pillar, just above where the guy walks, but it didn't seem too major - especially considering I was working with divx here. I added a little garbage matte just to the top of the window and it fixed it up very nicely.

Your blue is perhaps a little too washed-out...bluescreens tend to be a little bit deeper/darker than that. Although, as schwar said, green is the colour to go for if possible.

I think with some fiddling of the chromy settings you should be able to get a good key just from this footage though. Use garbage mattes selectively to tidy up any areas that you can't key out automatically.
Posted: Mon, 15th Mar 2004, 4:51pm

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MarkB

Force: 220 | Joined: 7th Mar 2004 | Posts: 47

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OK - thanks.. I will spend some more time playing with the options and using garbage masks. I suspected its just my inexperience with the product.

Mark
Posted: Mon, 15th Mar 2004, 4:57pm

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Redhawksrymmer

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SuperUser

You're fantastically good at animating LEGO. eek Great stuff!

Good Luck!
Posted: Mon, 15th Mar 2004, 5:04pm

Post 10 of 11

MarkB

Force: 220 | Joined: 7th Mar 2004 | Posts: 47

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Thanks for the kind words!

This is the *final* scene for my upcoming movie (Extreme Delivery). I think it will be pretty good, even though it will only be my second movie. Its got a lot of special effects and (hopefully) some good dialog. And I'm pretty sure the ending will at least make you smile.

If your interested, I've got a trailer online at:
http://www.markbsplace.net/Movies/ExtremeDelivery/ExtremeDeliveryTrailer-320x240.avi - low rez (320x240 2.3mb .avi file)

http://www.markbsplace.net/Movies/ExtremeDelivery/ExtremeDeliveryTrailer-640x480Divx.avi - High rez (640x480 3.4mb DIVX .avi file)

And of course when its done, I will be posting it to the "Cinema" area..

Mark
Posted: Tue, 16th Mar 2004, 5:19pm

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rmw

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The lego animation is great. I downloaded the clip and I get near-perfect results, I just used saturation and super contrast to get a nice blue.