[Help selecting a poorly defined area in an image.]

Ah, okay, thanks, I was thinking that there could be some kind of tool that only selects as long as the pixels are darkening, but that may not even be possible, but thanks for the tip to do it that way, I was too set on the idea of erasing the inside that I forgot to consider inverting my plan.

[Help selecting a poorly defined area in an image.]

So, I am trying to select the thorns/rose seperately in the attatched image, but because of the varying levels of definition of the borders, I cant see any way to do so other than by hand pixel by pixel. Are there any addons that make this task easier, or is there a simple function that I have just not seen.

 

In case it helps, my goal is to overlay it on three seperate colored layers, and "cut through" the lower layers with the top layer set on multiply, that way coloring the details while leaving the shading intact.

 

 

http://i.imgur.com/LWPbWTq.png