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Extracting white fur?

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  #11  
Old 05-11-2007, 03:21 AM
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bart_hickman bart_hickman is offline
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Re: Extracting white fur part two

The background eraser can make quick work of this one. I just experimented a little with the tolerance setting and found 70% is perfect. Set the sampling for the background swatch and discontiguous erasing. The sample the blue background color and set the background swatch color to that same color. Then brush away. Maybe do a little clean up with the regular eraser. Takes a couple minutes. I was a bit sloppy here, but you get the idea.

The blue fringe is distilled out and replaced with transparency so you can drop it down on any new BG color the new colors will mix in roughly the same as the original ones did.

I attached a couple of versions (white, orange, rainbow).

Bart
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File Type: jpg whitebg.jpg (56.2 KB, 43 views)
File Type: jpg orangebg.jpg (61.5 KB, 42 views)
File Type: jpg spectrumbg.jpg (67.4 KB, 38 views)
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  #12  
Old 05-11-2007, 01:32 PM
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Britsdad Britsdad is offline
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Re: Extracting white fur part two

tOm.....welcome to RTP.
Here's just a quick try at your pic useing free GML Matting pluggin found here... http://research.graphicon.ru/image-p...matting-6.html .....it seems to do a good job even in the two minutes I tried, you should be able to get it better with care.....
John
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  #13  
Old 05-13-2007, 08:35 AM
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Re: Extracting white fur?

I have read that using channels to isolate things like hair and fur is a viable option. Here is an article: http://graphicssoft.about.com/od/pho...rbps_2fwks.htm
As well:
http://www.planetphotoshop.com/selec...-channels.html

Last edited by arphot; 05-13-2007 at 08:46 AM.
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  #14  
Old 05-13-2007, 05:10 PM
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bart_hickman bart_hickman is offline
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Re: Extracting white fur?

Quote:
Originally Posted by arphot View Post
I have read that using channels to isolate things like hair and fur is a viable option. Here is an article: http://graphicssoft.about.com/od/pho...rbps_2fwks.htm
As well:
http://www.planetphotoshop.com/selec...-channels.html
Image-based masking (which is the generic name I use for that type of extraction) is an excellent first step, but it doesn't address the issue of background colors mixing with subject colors in the boundary areas, or when the subject is partly transparent. Ideally there are two more steps required
1. remove the old color (blue in the O.P.'s example)
2. make sure the new background color mixes in where the old background used to mix in.

Tools like the background eraser and the photoshop extract filter address all three steps in one shot assuming they work well (they don't always work well.) Image-based masking is my backup plan when the BGE doesn't work on a fuzzy-edged subject.

Bart
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  #15  
Old 05-13-2007, 09:05 PM
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omytfineo1 omytfineo1 is offline
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Re: Extracting white fur?

I have the Katrin Eisman book on Masking and Compositing which is great for things like this. I believe this is an excellent candidate for isolating the fur from the background (since the two are rich in contrast from one another) by duplicating the green channel, and using levels or curves to build a mask. You would then take your selection from the mask you created and delete the unwanted pixels. I believe with some little tweaking, you will get what you want...
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  #16  
Old 05-15-2007, 05:22 AM
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Re: Extracting white fur?

Sorry for the late reply guys! I have been out of town for a while(summer vacation). Anyway, thank you for the help, I haven't tried the techniques since I just arrived, I'll be trying it out after this.

Thank you! Thank you! and Thank you!
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