Re: QTR - Toner reduces Dmax
2005-11-08 by Roy Harrington
It's usually hard to predict what more ink will do to the dMax. Too much ink can reduce dmax -- even if its just black! Tom's suggestion is one good way to keep the non-black inks out of dMax. You can also mix the cool grays into the profile using COPY_CURVE to duplicate the warm gray curves into the cool grays. This way the "cool toner" inks just cover the warm gray inks rather than extend all the way to 100%. Then just adjust the sum of the ink limits since you will be having both warm & cool grays in the same area. Roy --- In QuadtoneRIP@yahoogroups.com, "Tom Moore" <r.t.moore@r...> wrote:
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> > I find it difficult to use the raw/acv curve feature of QTR and usually look > for other techniques such as adjusting the gamma or shadow values, or using > an otherwise unused ink position as a placeholder to move a curves over. > Since you're using all your ink positions, you might try the following: > > Rather than trying to neutralize your warm curve using the cool inks as > toners, you could try the following. Create a separate cool curve using your > K and the two toner inks. You can control, to some extent, how deep into the > shadows the darkest cool ink is used by adjusting its density value in QTR. > Then you can cool your warm curve by blending in your cool curve when you > print. > > HTH > > Tom Moore > > > > -----Original Message----- > > From: QuadtoneRIP@yahoogroups.com [mailto:QuadtoneRIP@yahoogroups.com] On > > Behalf Of rbehr2001 > > Sent: Sunday, November 06, 2005 5:32 PM > > To: QuadtoneRIP@yahoogroups.com > > Subject: [QuadtoneRIP] QTR - Toner reduces Dmax > > > > I recently completed a 5 gray ink set for an Epson 2200 with two cool > > toners. The carbon works great giving a very smooth warm print. The > > problem arises when I try to add cool toner. I get a significant drop > > in maximum black (over .07 in optical density). I tried using the toner- > > curve.raw used by 2200 UT and I tried making my own toner.acv curves. > > > > I assume the objective is to keep the light toner inks out of the deep > > tones. I did that with my curve and also tried various combinations of > > toner shadow, highlight and gamma numbers, but no luck. By the way, > > how can I see/modify raw curves? Photoshop doesn't open them. > > >