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Color sifting: yellow turns into orange

Posted: Fri, 12th Nov 2010, 11:35pm

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FXhomer107883

Force: 0 | Joined: 8th Nov 2010 | Posts: 3

Member

Hi,

I am using Photokey Pro 2. Using a green screen (bright green) I notice that the color bright yellow (the team color is white blue and yellow) the yellow turns into orange. The other colors are fine. If I reduce the light suppression lower to get the proper yellow (or close to it) I get the green screen color reflecting in the players hair. So looks like I get the choice of green hair with proper yellow, or good hair with my yellow turned to orange.
Is there anybody who had that problem? is there a solution? Maybe Photokey 3 or the new Photokey 4 will have a more selective color suppression?

Thanks for you help.

Claude
Posted: Sat, 13th Nov 2010, 12:39am

Post 2 of 6

Axeman

Force: 17995 | Joined: 20th Jan 2002 | Posts: 6124

VisionLab User VideoWrap User PhotoKey 5 Pro User MuzzlePlug User PowerPlug User PhotoKey 3 Plug-in User FXhome Movie Maker FXpreset Maker MacOS User

SuperUser

Even in version 2 there are different types of spill suppression, aren't there? In the type menu, switching from Standard to Extended, or vice versa, should help with that situation. Adjusting the strength down will just remove the effect; its better to change to a different Type of spill suppression that affects the colors differently.

I know in version 3 there is an additional Advanced spill suppression type in the Pro version, but even with an older version changing the type should help.
Posted: Sat, 13th Nov 2010, 1:35am

Post 3 of 6

FXhomer107883

Force: 0 | Joined: 8th Nov 2010 | Posts: 3

Member

Hi,
Version 2 Pro has the standard and extended spill supression. I use the extended and move the slider a bit. But it gives me the same result. I get orangy yellow of green hair...
Claude
Posted: Sat, 13th Nov 2010, 2:06am

Post 4 of 6

Axeman

Force: 17995 | Joined: 20th Jan 2002 | Posts: 6124

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SuperUser

Then it could be a lighting issue. Can you provide a link to one of the original greenscreen pictures, before it is keyed?
Posted: Sat, 13th Nov 2010, 4:18am

Post 5 of 6

FXhomer107883

Force: 0 | Joined: 8th Nov 2010 | Posts: 3

Member

Thanks for you help.
The background was lit with 2 flash heads at f6.7 evenly.
The subject was shot f8 the same as the camera setting.
before
http://www.ctphotogallery.com/IMG_4750.JPG
after
http://www.ctphotogallery.com/Bantam_B4_IMG_4750_Custom.jpg
Posted: Sat, 13th Nov 2010, 6:28am

Post 6 of 6

Axeman

Force: 17995 | Joined: 20th Jan 2002 | Posts: 6124

VisionLab User VideoWrap User PhotoKey 5 Pro User MuzzlePlug User PowerPlug User PhotoKey 3 Plug-in User FXhome Movie Maker FXpreset Maker MacOS User

SuperUser

Thanks for the images. The greenscreen seems pretty heavily biased toward the yellow side of green, which likely isn't helping the issue. Getting a truer green would help isolate the color. I noticed that if the spill suppression is switched to Standard, then the yellows look fine, but the redder tones, mainly the kid's hair, end up still having some spill, and the blues get darker and richer.

Unfortunately, when working with spill suppression, there will be some color shift; its inherent to how spill suppression works on an image. So of course, the ideal solution is to improve the lighting to remove the spill to begin with, or at least to minimize it, so the spill suppression can be toned down more. You might try getting more distance between the subject and the greenscreen, making the greenscreen a bit less bright,, and/or throwing a magenta gel on a backlight for the subject.