channel extraction with detailed backgrounds

[PsYcHoPaTh]

How do you use channels for extraction on an image with a detailed background? Like say for instance, the model is standing in front of a group of people. I know how to do it on a solid background, but because of the differences in the background whenever I use levels I can't get the background white and the hair black.....

Thanks.

[Crapaud]

It entirely depends on the image, Psycopath. Different images can require different techniques to extract them. In a complex image I've used different methods for different parts of the pic, saved the resulting selections in an alpha channel, then built the final selection in a separate channel.

[PsYcHoPaTh]

could you explain some of those methods or perhaps link me to a decent tutorial that is not a video please?

[skydog]

this is a good resource...get it used for $8

http://www.amazon.com/Photoshop-Chan...6326761&sr=8-1