Hey Jim -

> I'm looking at p 126 of The Artist's
> Guide to the Gimp and all it says is screen brings out highlights.  What
> did I do when I followed your directions?

Check out Grokking the Gimp, available through the web browser 
section of your Gimp toolbox.  This book, available online and 
for free download, is an excellent piece of work and explains 
all of the mathematical basis for the various blending modes far 
better than I could do off the top of my head in this email.  
The details you want are in Section 5 (5.6, to be exact).

HTH,

-- 
--Jeff

Jeff Trefftzs <[EMAIL PROTECTED]>
http://www.tcsn.net/trefftzs                    Home Page
http://gug.sunsite.dk/gallery.php?artist=68     Gimp Gallery
http://trefftzs.topcities.com/home.html         Photo galleries



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