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11/03/2009 11:48:47 AM · #1 |
| I'm trying to do some composites, and I want to find the easiest (and cleanest) way to end up with a usable image. Essentially I want to shoot on white seemless and then pull the subject out of the seemless and position on another back ground. What techniques do you use for knock outs? |
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11/03/2009 11:56:36 AM · #2 |
There is probably an easier way that I have not yet learned, but if the item is a contrasting color, it is fairly easy to do a selection of the background and then just delete the selection.
 
This shot then needed a little touchup of the shadows on the bottom to make it look natural. I've had more difficulty with the machines that have some tan covers. Those are trickier to select separately from a white background as the color is so close. I have been trying to put more light onto the background to make it easier. Still learning what works and what does not. |
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11/03/2009 11:57:29 AM · #3 |
If you want to do it the 'right' way, you should always (except when there is a lot of green in the subject) use a green background when the purpose is to separate the subject from the background.
Green is usually very easy to remove without affecting the rest of the image and is often used in studios for just this purpose. |
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11/03/2009 12:01:09 PM · #4 |
Originally posted by TrollMan:
Green is usually very easy to remove without affecting the rest of the image and is often used in studios for just this purpose. |
Aha. Thanks for the tip. I've used up that roll of white paper now (got 5 copiers out of a 50 foot roll), so I'll make sure to get green this next time. |
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11/03/2009 12:07:08 PM · #5 |
Originally posted by TrollMan:
If you want to do it the 'right' way, you should always (except when there is a lot of green in the subject) use a green background when the purpose is to separate the subject from the background.
Green is usually very easy to remove without affecting the rest of the image and is often used in studios for just this purpose. |
Yeah but then you run the risk of picking up a color cast. I thought green was more for keying. I'm not doing a chromakey type thing, but fully pulling the subject out of the background, so the color of the background hsouldn't really matter, as long as it provides solid separation between the subject and the bg. |
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11/03/2009 12:08:30 PM · #6 |
Originally posted by Yo_Spiff:
There is probably an easier way that I have not yet learned, but if the item is a contrasting color, it is fairly easy to do a selection of the background and then just delete the selection.
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Nightmares!! I slung Konica Minolta machines for 2 years. What brand is that? I can't make out the logo, although it does look like the KM logo.
Edit: Nevermind, just saw they were NEC
Message edited by author 2009-11-03 12:11:19. |
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11/03/2009 12:59:40 PM · #7 |
| If you have CS3/4 then the quick selection tool makes this quite easy. |
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11/03/2009 01:14:13 PM · #8 |
Originally posted by AJSullivan:
Originally posted by TrollMan:
If you want to do it the 'right' way, you should always (except when there is a lot of green in the subject) use a green background when the purpose is to separate the subject from the background.
Green is usually very easy to remove without affecting the rest of the image and is often used in studios for just this purpose. |
Yeah but then you run the risk of picking up a color cast. I thought green was more for keying. I'm not doing a chromakey type thing, but fully pulling the subject out of the background, so the color of the background hsouldn't really matter, as long as it provides solid separation between the subject and the bg. |
In that case I would just burn our the background like Yo_Spiff did with the copier. I did the same thing with this shot and even the almost white hair is separated well from the background.
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11/03/2009 03:35:04 PM · #9 |
Take a look at the thread that I started recently in which I asked a similar question.
There was a ton of help provided there.
edit to add the thread...ooops!
How do I cut out an object cleanly?
Message edited by author 2009-11-03 15:37:28. |
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11/03/2009 04:01:21 PM · #10 |
If the background is complex and quick selection tools don't do the trick, I go to the channel's palette and look for the channel that shows the greatest contrast between what I want to keep and what I want removed. I then duplicate that channel and start dodging and burning the heck out of it. I don't use the actual dodge and burn tools but instead I use curves and the paintbrush (set to overlay). Works great on everything including hair extraction.
Message edited by author 2009-11-03 16:02:37.
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