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greenbg issues?

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  #1  
Old 02-01-2009, 10:35 AM
Gee Gee is offline
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greenbg issues?

Hi!

Hello, i do photography most of the time.
right now it's soooo cold that i can't shoot outside with models/friends and doing our ideas. Thats why i shooted one of my mate last friday in a rented studio. on a green bg.

Unfortunately this is the first time i do a full-composite picture.
few months ago i did took some diff pictures and merge them, but it was the same scene and easy to do.

Right now i need to remove all the green from the studio pic, to include it on the background

but, but... i tried two ways.
the first one is a color range with the green cast and then delete the selection... but its too approximative and theres like few green pixels left. But i mean... like a lot.

then i tried another tech. is using background eraser tool in a discontiguous way, with a 50+/-% tolerance etc. unfortunately sometimes it removes color/texture from the model cuz there a lil bit of green cast on him, you knoW?

so... how can i do that propertly?
here's few examples @100%

(also maybe you can't see that some parts of the clothes/skin are missing cuz its a jpg and its filled with white, but i miss some parts at low opacity.)



big big big thanks in advance


gee.
(my flickr ;p)
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  #2  
Old 02-01-2009, 02:16 PM
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mistermonday mistermonday is offline
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Re: greenbg issues?

Gee, I see your problem. A channel mask is most likely your solution. I suggest you post a copy of the original image or some part of it that has your subject and the green bg.
Reghards,
Murray
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Old 02-01-2009, 03:58 PM
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igot2pman igot2pman is offline
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Re: greenbg issues?

Quote:
Originally Posted by mistermonday View Post
A channel mask is most likely your solution.
I agree with mistermonday, after you do the color range you can create a mask.

To solve your first problem of not selecting all of the green, start with the #3 dropper witch selects one color. Then select the #4 dropper that can add to the original selection. Just keep selecting until you get it all. The #5 dropper subtracts from the selection.

The fuzziness slider also expands the selection but be careful with this as it can quickly start selecting what you don’t want,

Once you done selecting you click ok. Then you see the lines of the selection. Press the #6 and it will create the mask (#7). To paint more on the mask, you must select (click) the mask and paint with black is to hide and white is to show. Once you have the mask you can continue to mask or reveal whatever parts you want. You can also paint with a low opacity brush to show a little or hide a little

Put the background under the layer with the mask and it will show through the black parts. The mask allows you to keep the info that you would have deleted and you can then easily go back and show more later.

Hope it helps,
-Keven
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  #4  
Old 02-05-2009, 05:55 PM
jjativaj jjativaj is offline
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Re: greenbg issues?

Don't bother. Although PS is perhaps the best imaging software out there, it is the worst for green screen. I had to settle for a plug in. I do a lot of green screen work and I use Keylight.

http://www.modelmayhem.com/jat777
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Old 02-05-2009, 06:25 PM
Gee Gee is offline
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Re: greenbg issues?

isnt that only for after effects? :o
(sry i totally dunno this)
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Old 02-05-2009, 06:46 PM
jjativaj jjativaj is offline
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Re: greenbg issues?

They also make a version for SHAKE. A Mac program. That is where I do all my green screen then transfer to photoshop. There is another plug in that works directly in PS. It is called Primatte.
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Old 02-05-2009, 06:48 PM
Gee Gee is offline
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Re: greenbg issues?

ok so i have to get after effects, use keylight on the pic and then import the pic in photoshop :/
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Old 02-05-2009, 06:49 PM
Gee Gee is offline
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Re: greenbg issues?

ow wicked i'll check out primatte
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  #9  
Old 02-06-2009, 08:47 AM
Gee Gee is offline
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Re: greenbg issues?

here's the first one!!

http://www.flickr.com/photos/gkayacan/3258288682/
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  #10  
Old 02-06-2009, 10:31 AM
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Markzebra Markzebra is offline
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Re: greenbg issues?

The Background Eraser and Extract tools should really never have been introduced - they were both developed a long time long after the good selection tools. These were the first sign that things were going wrong at Adobe, with regard to new feature development. Color range will produce a good starting point, you can also look at your Green Channel, and the A channel in LAB. I seem to remember Russel Brown had a tutorial at one point about quickly removing greenscreens, and using the Green slider in Hue/sat to take the edge spill out.
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