QTR-Quadtone RIP

You can try to change GRAY_GAMMA (midtones), GRAY_SHADOW (shadows), and 
GRAY_HIGHLIGHT (highlights). Higher values make that part of the curve 
brighter, lower values darker. Gamma will usually stay between 1 and 2 
somewhere while the other two can be anything from 0 to 300 or possibly 
even more.

I honestly don't know how well it works to tweak these values with 
linearization in place. You're supposed to tweak them first and do the 
linearization as a last step. You can try and see how it works. If the 
results are horrible switch off linearization and try again. You can 
actually pretty good curves without linearizing. I've made a couple of 
curves which I haven't bothered to linearize simply because I already 
get great prints from them just with the adjustments mentioned above.

--
Daniel Staver
http://daniel.staver.no


> Hi John and Dan,
> 
> I went with the lighter modification below as a start.  Installed it and tested.  The print 
> comes out a bit blue which is great,
> 
> because I can easily blend it with the warm one to get just what I want.  And also because I 
> just learned a ton.  :)  
> 
> It did make the print overall too dark though---as might be expected.  Is there an easy 
> number to change for that? or just reduce the ink limit?
> 
> as a start will re edit the curve to an intermediate effect, maybe LC=20 or 25.  Likewise for 
> LM.  
> 
> Bottom line is that blue is good, allows flexibility, and I am on my way.