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help with spotty background

Posted: Wed, 12th Aug 2009, 6:20pm

Post 1 of 8

FXhomer67560

Force: 400 | Joined: 7th Aug 2009 | Posts: 2

PhotoKey 2 User

Gold Member

im trying to use a blue and green screens with photokey 2 to take pictures of my products so they come out on a white background to blend in with my website.
but i always get spots of blue on the background.
i dont know how to fix it without using a mask.

http://dcomcomputers.com/i-788653-inter-tel-axxess-evmc-voicemail-w-pal-550-5030.html

i want to be able to do like 60 pictures an hour as i have many products. looking for fast solution.
any help?

thanks
mike
Posted: Wed, 12th Aug 2009, 11:20pm

Post 2 of 8

Axeman

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

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SuperUser

It looks like it could be related to your lighting. Can you post a link to one of the images before keying, so we could play with it? Then we could offer more specific help.
Posted: Thu, 13th Aug 2009, 12:50am

Post 3 of 8

rogolo

Force: 5436 | Joined: 29th May 2005 | Posts: 1513

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Gold Member

Judging from the look of label on that part, it looks like your white balance is seriously off. Correcting this problem and enhancing the pre-keyed image should help tremendously. However, as Axeman said, upload some photos to ImageShack or another site so we can check them out.
Posted: Thu, 13th Aug 2009, 8:20am

Post 4 of 8

Simon K Jones

Force: 27955 | Joined: 1st Jan 2002 | Posts: 11683

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FXhome Team Member

As the others say, it'd be easier to diagnose this if we can see the original photo.

There's a few things that spring to mind already, though:

- As Rogolo says, it looks like there's some serious lighting weirdness going on, as the voicemail card is seriously yellowy-orange. This kind of lighting might also be affecting the greenscreen in an adverse manner.

- It looks like the card is sitting directly on the greenscreen, hence the shadow around the left and lower sides. You'd get better results if you could raise it up off the surface. The more distance between the subject and the greenscreen the better.

- When photographing small objects I've sometimes encountered problems whereby the camera is so close you start to see the individual fabric weave of the greenscreen, which can cause problems. The patterning of the fuzz around the card suggests this might be happening. Again, getting more distance between the card and the greenscreen would help.
Posted: Thu, 13th Aug 2009, 3:06pm

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TubeTape

Force: 9542 | Joined: 24th May 2007 | Posts: 169

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We run into a lot of folks trying to do something very similar. They are trying to take product shots for catalogs. A light tent can go a long way to eliminate lighting problems when it comes to these types of projects.
Posted: Wed, 26th Aug 2009, 6:15pm

Post 6 of 8

FXhomer67560

Force: 400 | Joined: 7th Aug 2009 | Posts: 2

PhotoKey 2 User

Gold Member

ok i uploaded two images to imageshack. they are ones i played with today. my business been busy all last week as we have 4 guys and i was only one here. yeah a little hectic. anyways, i played with lighting, but not perfect still. i moved the card onto a pedastal to get it furthur away from the blue. this is my setup in third pic
same issue. before and after pics here
i appreciate any help guys.


http://img39.imageshack.us/i/blue2j.jpg/

http://img21.imageshack.us/i/done2roq.jpg/

http://img268.imageshack.us/i/setupf.jpg/

is my camera resolution too high?
Posted: Wed, 26th Aug 2009, 11:41pm

Post 7 of 8

Axeman

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

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SuperUser

No, the resolution isn't too high. Higher resolution is better.

The blue in the background is quite grey, if you can get a truer blue it will definitely key better. The lighting is fairly decent as far as being even, but the blue isn't blue enough, which could be the result of your backdrop being the wrong color, your lighting not being bright enough, or the wrong color temp, or a combination of these factors.

Also, in the first image I can see some artifacting/noise, especially toward the top corners. Is this is a result of compressing the image for web upload? If it is in the original, then you need to increase the light and decrease the ISO.
Posted: Thu, 27th Aug 2009, 7:10am

Post 8 of 8

Simon K Jones

Force: 27955 | Joined: 1st Jan 2002 | Posts: 11683

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FXhome Team Member

Yeah, I think 'more light' is probably the best bet here. The blue needs to be more vibrant, really punch out of the image. At the moment it's very subdued and not really contrasting with the subject.