QTR-Quadtone RIP

What dpi are you using? What material are you using? 
Try a few different dpi settings and see if that makes  difference. Also go into the driver setting and locate the density setting..try a few variants.. It sounds like your inks are not "adhering" to the surface possibly.. When I print on Mylar for a transfer patch fix that's  what I see. 
I'm not intimate with the 3800 but it has a pretty good dither pattern... I'm leaning towards a material issue.. 
Have you done this successfully before with this material?  or is it new turf...........

jimbo
  ----- Original Message ----- 
  From: colinflanary 
  To: QuadtoneRIP@yahoogroups.com 
  Sent: Sunday, October 12, 2008 10:21 AM
  Subject: [QuadtoneRIP] Inconsistant magenta density with digital negatives



  I'm trying to use version 2.6 and a 3800 to make digital negatives. I
  can't seem to get even highlight densities (skies mainly)to print
  without odd very random stripes of heavy magenta. I'm using an even
  dark ink mix of 15 (black, cyan and magenta) and 8 yellow and 32 K
  boost, but every so often I'll get these 1/2-1" bands with way too
  much magenta in the mix. Sometimes these stripes will alternate the
  length of the sky area, other times there will be a single very wide
  stripe at the end of the same sky area. The ink level on the printer
  confirms this- the magenta cart is half as full as the other dark
  inks- which suggests it's happening more than I'm aware of.. I've
  tried changing the dark ink limits slightly to no effect. Any ideas
  much appreciated.



   

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