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Chroma Key Green HELP
Old 02-06-2006, 09:23 PM   #1 (permalink)
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Lately I have been shooting for a publication that likes to cut out my images and add their own backgrounds and typeset. There are other ways to describe it but anyway, I decided to shoot a few on a new chroma key green background to see how easily it is to remove.
As you can see from this image I’m kinda lost. This image background has been removed and replaced very roughly but it helps point out a specific question.

How do you deal with the overspill of green cast on your subject?

I have been using PS since its conception and currently Cs2. Don’t hold back.
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Re: Chroma Key Green HELP
Old 02-06-2006, 10:46 PM   #2 (permalink)
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If model is wearing white, use flat black background. If dark clothes, white background. Grey works too, but sometimes harder to use selection tools.


Model Flor with white...
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Somebody said something about. . .
Old 02-06-2006, 10:59 PM   #3 (permalink)
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using a color background as close to the final image (if you know what you are going to do with the image beforehand, This will give you less grief when you try to cut out the background. There are a tone of tutorials on this subject but frankly the whole thing is a paint in the a$$. (and the $$ stands for time and money). Check out http://www.russellbrown.com/ and do a google for photoshop tutorials.
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Re: Chroma Key Green HELP
Old 02-07-2006, 07:57 AM   #4 (permalink)
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I find the most effective way in CS (I don’t have CS2) is to use “Hue/Saturation.� Limiting your adjustment just to the offending colors in this case Greens and Yellows, you can expand or decrease the range using the slider.

Another tool in CS is “Replace Color� but it takes a bit more time to use this.

This works great provided there are no Greens and Yellows intentionally in the picture, in these cases you would need to protect those areas with a mask or selection.

Hope this helps, Jimmy
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Re: Chroma Key Green HELP
Old 02-07-2006, 10:06 AM   #5 (permalink)
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Jim

Two suggestions. One - move the model farther away from the backdrop. Two, since you're not using the background anyway put a couple of lights to create a single wash of color/tone but turn the lights down so that they don't create the spill.
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Re: Chroma Key Green HELP
Old 02-07-2006, 12:41 PM   #6 (permalink)
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That would be very helpful but I don't think I'll do this again.
I never had trouble seperating before the green thing.
Just thinking too much I guess. [img]/ubbthreads/images/graemlins/cool.gif[/img]
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Re: Chroma Key Green HELP
Old 02-07-2006, 12:44 PM   #7 (permalink)
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Controlling the range sliders by hue and saturation...
That does it beautifully. I knew that, must have had a
brain fart or something. Excellent!
Thank you very much! [img]/ubbthreads/images/graemlins/cool.gif[/img]
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Re: Chroma Key Green HELP
Old 02-07-2006, 12:49 PM   #8 (permalink)
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I’ve always used blacks and whites before, and never had this trouble.
Was looking for another shortcut.
Just thinking too much I think. Oops, there it goes again.
Thanks
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Re: Chroma Key Green HELP
Old 02-07-2006, 05:34 PM   #9 (permalink)
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I went through the same troubles a couple of years ago... 29 background drops. Lost my butt on that one.

I use black or white now too, white can fringe too if you're no careful but at least it ain't green. I use the path tool on everything but hair and I pick black or white BG paper depending on which will contrast best with the hair.\

I know you're an immigrant but, what the the hell... Waaaaaaaaar EAGLE!

Chip
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Re: Chroma Key Green HELP
Old 02-07-2006, 06:55 PM   #10 (permalink)
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Its obvious from your results that you had lots of bounce back from the background onto the model. This simply means that your lighting was not set up properly. The background needs to be "evenly" lit. The more even, the better. You need to have the model far enough from the background so that none of the light striking the background hits the model. This can be controlled by the angle at which the lights hit the background. Try to make certain that the model is not wearing anything that is the same color as the Chroma Key. So in this case, no green. With the proper lighting you can then do the knockout and you won't get the green fringe.



Cheers,
rfs
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