I’m having some quality issues with my HP DesignJet 5500UV.
I am getting small dots in some solid colors. They kind of look like pepper. I also have this problem with the other three channels (CMY) but it’s most abundant in the black.
I also have a very granular (grainy) black that kills all the details in anything phographed black (i.e. can’t see the creases in a pair of black pants, justs mush).
I have a pc with wasatch softrip, gretag macbeth profile maker publish pro 5.0, and an eye one spectrophotomer.
I turned off the varware in Wasatch, set the settings to LcLm, 10 pass, unidirectional. I went through and limited my total ink and limited the individual channels using precision stochastic screens for half toning. I scanned in a linearization curve and made my own output profile using both 1.1 CMYK Chart and ECI2002 CMYK Chart (for 2 different profiles).
The front panel settings on the HP are set to productivity semi gloss at max quality. I am using a luster paper made by intelicoat.
I’ve heard that it could be a ucr/gcr problem, that the grainy black is due to a lack of magenta and yellow, and also that it is a problem with the profile.
If it is any of these issues can someone please go into detail as to what I should try especially if its due to the profile.
Also how can I tell if my gray balance is good or bad? And if it is bad how can I fix it? Should I have good gray balance before I linearize or is it something that output profile fixes?
I would appreciate any help.