Russell Brown's site has some great tips in QuickTime movie format. Hope you have a nice fast connection, or a great deal of patience.
The following link to a QT movie "Advanced Masking" has been created for Photoshop 7.0 or newer, and weighs in at 21 MB. As the blurb says on his site, this one isn't for beginners.
Here's a really useful and informative tutorial on masking trees, from Anson Vogt at Phong.com.
Learning the techniques here, you should have a much better handle on extracting other difficult objects so that they blend will on a different background.
(Thanks to Jim Dempsey at CreativeGuy.com.)
For a decent overview of 5 different techniques for isolating a foreground object, have a look at the following link.
From the article:In this article, we'll explore five different methods to isolate objects in Photoshop. As you follow this tutorial, you'll gain a how-to explanation for each technique. You'll also get the stats on how long each method takes, and my opinions as to when each method is most appropriate.
The methods I'll demonstrate include:
* Using Photoshop's Magic Eraser tool
* Using Photoshop's Background Eraser tool
* Using the Extract command
* Using Quick Mask mode to make a selection and layer mask
* Using the Pen Tool to make a selection and layer mask
From Lyn Eggleston in the PS for Windows Forum comes the following collection
of background isolation articles from the "Graphicssoft.About.com" pages:
From MacDesignPro:Manipulating and masking with paths
"If you're new to Adobe Photoshop, it's likely you haven't played around with paths too much. The path tools in Photoshop aren't really like those in vector illustration tools (like Illustrator), which are used principally for the creation of vector objects. In Photoshop, paths can be used (clumsily) for this purpose. But they have a more useful function in image manipulation: masking."
Here's another angle on masking for hair and other "fuzzy" edges.
The link takes you to a summary article on the CreativePro website.
On that page, there will be a link to a lengthy PDF tutorial.
Also on the page linked below will be links to the image files used in the tutorial.