That's the hard way !   Get it right in camera, avoid PS ! 

I use a technique smiler to the one described on this video:

Creating a White Background with a Channel Mask

Quote from: leaf on March 08, 2010, 05:42

How to Isolate an Image on White - Photoshop Tutorial [In-Depth]

anyone have a better way?

Hi Leaf,

You mention The Wacom tablet, tell me how do you like it, how often do you use it, and what size of tablet is yours?

Thanks,
Kone

I have the smallest tablet - 4x6 I believe.  I like to draw with my wrist and not my whole arm so I chose the smallest one.  To pick the size I needed I looked at the screen, then with a pen on a piece of paper, looked at the top right corner of the screen and moved the pen to what I felt was the top right of the paper.  Then looked at the bottom left of the screen imagining I was moving my hand with the mouse on the paper - drawing with the pen as I went.  I looked around the screen a bunch of times from all the corners and eventually got a fairly defined box on my paper.  I measured it and bought that size of tablet.

I couldn't use photoshop any other way now

Here is some more Wacom discussion