A real stumper for me. Been printing k7 in 2 identical 7880’s for a long time. One is loaded with a Selenium ink set , the other a Carbon set. Both printers were acquired used, the selenium one had much less mileage than the carbon one but both are in excellent condition and currently appear to have perfect to virtually perfect nozzle checks. Attached sample does show the carbon one is missing a single nozzle line in shade 5 but otherwise perfect. Also sample shows both nozzle check prints show the exact same density
for each position , as far as i can tell. Both printers are used virtually everyday and almost never have any clogs. Any occasional clog gets cleared right up with a single head clean. The problem , recently being observed, that an identical image file sent to both printers, over a network from 2 different computers, are not matching very closely at all. Traditionally they both always did and outputs always match monitor display , with the correct soft proof profile enabled. The selenium is still an excellent match, in resolution, tone, contrast, etc. However the Carbon one is not even close anymore. As samples show Carbon output has what appears pixalation of some sort in midtones. Seems to be a dropout of density creating a blotchiness. I thought that maybe the computer sending over the network to the carbon host computer was losing data somehow so I temporarily changed the ip address of the carbon printer to that of the selenium and printed the same exact file with the same exact settings, curve as I had just printed to the selenium and the the output was still exactly the same as before. I’m pretty sure that I’m not dealing with incorrect curves or QTR driver corruption. I’ve since deleted and reinstalled QTR for the carbon printer. Also see sample 100 step tablet. Too me this also looks like identical density values, just different tone. Am I correct to assume that the carbon printer’s shade positions are all correct. All the tests are on type 5 and image files are from scanned b/w films. Print files are in greyscale , test outputs are scanned RGB to show tone color. Sample from larger format film is better resolution even in carbon sample than the other one from 35mm @8000dpi scan. I’ve always used your canned curves, with excellent results. Is it time to get custom curves for the carbon printer because the print head is starting to show it’s mileage compared to the other printer?
Both printers get about equal usage but at different times. Should I send the sample materials in for a closer examination? Or are the files have enough information.