Hi, Kathryn,

Have you tried using the magic wand? You can select the black and then  
use Refine Edges in the Select menu to sharpen up your stipples (or do  
the inverse with the wand, ie select the white areas and do the  
same).  Then fill the selected area with black , so that you have a  
"pure" photoshop version of your scan.  I've found this works quite  
well.  I've never thought to use Curves, though I have used levels,  
like Geoff.  If most of your scan is clean and you just have a few  
muddy areas you can select those and work the magic wand/refine edges  
on just that area.

~ Margy

Margaret C. Nelson, Ph.D.
Rumford Graphics Scientific Illustration
<[log in to unmask]>
124 1/2 Judd Falls Road
Ithaca, NY 14850

Need to leave or subscribe to the Sciart-L listserv? Follow the instructions at