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Subject has areas of transparency?

Posted: Wed, 1st Apr 2009, 3:06am

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FX78704

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First off - this software is *fantastic*. Talk about making something that would otherwise be daunting and painful into something enjoyable and easy. I will definitely be buying the software as soon as the boss gets in tomorrow to approve it.

I've got a weird problem - we photographed a model in black on a green screen, and when we extract her from the green screen, portions of her black outfit are transparent. Try as we might, we can't seem to make her "solid."

Here are the photos (original) and with Photokey (2 examples). They're even worse when we view them in Photoshop. Any ideas?







Thanks in advance for your assistance/ideas!
Posted: Wed, 1st Apr 2009, 3:13am

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Axeman

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SuperUser

Black has a very prevalent tendency to inherit color from the objects around it. In this case, the green from your screen is spilling onto the black, resulting in portions of the costume being removed when the green is taken out. In a situation like this, where your talent is actually in contact with the greenscreen, your best bet is probably to use a different color for the clothing.

For other cases, where the talent is standing or sitting, getting more distance between then and the screen can help, but that doesn't really look like its possible here. When your subject is that close to the screen, I think the best solution is to have her wear a different colored outfit. Although someone with a bit more experience might be able to offer some suggestions on tweaking your lighting setup to improve things as well.
Posted: Wed, 1st Apr 2009, 3:15am

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FX78704

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Dang - that would not be good (to have to reshoot). Hopefully there's another option... (got my fingers crossed)
Posted: Wed, 1st Apr 2009, 4:53am

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Axeman

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SuperUser

Theoretically you can use masks to make sure the transparent areas are retained, but it'll take a bit of patience to carefully draw in the edges with satisfactory results.
Posted: Wed, 1st Apr 2009, 9:08am

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Simon K Jones

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FXhome Team Member

Is the original image the actual original photo? It seems to be very low resolution and quite blocky in its colour reproduction.

Nevertheless, I pulled a couple of OK keys in PhotoKey 2 Pro:

With light spill:


Without light spill:


If you could upload the full quality original I could probably get better results.

To get these results, in the Key settings I lowered the detail to 0% and raised the level to 11%. I also changed the spill suppression to 'Extended' to remove more of the green spill on her lower leg.

A couple of masks were applied, one to remove the top-right bit and one to clean up some fluff underneath her back.

As Axeman says, photos where the subject is so close to the greenscreen can sometimes prove tricky. The dark shadowing under her back is the most problematic element - in future try to get some more light down there.

Hope this helps!