i just realized on one big print that i have steps in the soft trasition from mid gray to black. no matter with which software i built the profile.
i tried the 4096 atkinson chart. and the TC9.18 of hp.. last gave me best result with APS. even better then with i1 profiler. still not perfect.
and printing in the B&W mode is the same then in colour mode. i can tell that it puts down a lot of color in the B&W mode, too by the way.. mucho yellow in the black!!
Dmax is 2.4 .. i can live with that!
again my question. i have to buy that QTR program, to use the chart, right?
the first answer about profile optimization with i1profiler.. i realized the chart has 2000 patches.. that seams too much
thanx for the link to the group. i will try that..
If you get yellow in the black even in the B&W mode of the HP driver then there is something wrong with your heads, check the calibration targets of the printer itself, polluted grey/black patches in that target means a hardware issue. If they are fine and the HP driver in B&W mode does it wrong check the Advanced Color settings, the slider for yellow may be shifted from neutral. Could affect your color prints too. BTW, use "Printer does color management" in the driver settings for the B&W mode as HP recommends, set AdobeRGB as the expected color space. Load 2.2 gamma greyscale images in the application you print from, Photoshop or Qimage. Do a profile to profile conversion to Gamma 2.2 of that neutral sRGB file you have and save a plain Tiff preferably, no odd color channels or layers interfering . Set the application's color management to "Let print do color management". If you see steps in the grey transitions then calibration is not optimal, calibrate the printer again on that paper. If you see very subtle steps then a custom QTR profile could solve that. The custom QTR profile made you do a profile to profile conversion on the image from Gamma 2.2 to the QTR profile and print that image through the same color management route described above. There should not be yellow in the blacks/shadows, not as a color bias, not as yellow dots seen through a microscope.
If on a Mac you could ask a Mac owner about the process above, its CM is too smart for me and many other users.
If that baryta paper is one that has an OBA component in the paper white and you have a profile creation workflow + hardware that might compensate a cold paper white with some yellow etc to create a neutral greyscale image on a cold paper, you might see yellow/red/magenta dots in the highlights to say 70% black but not in the black. Altogether an unusual approach so a highly unlikely cause too.
What Onyx does in whatever print mode is outside my knowledge and so are the steps you make to get that total profiled.
QTR is shareware. If it does what you like it is worth the price. I paid for it many years ago, hardly use it anymore but for the profile creator and never regret the small sum paid. Other feelings about my Wasatch SoftRip.
My last cents on the subject.
Met vriendelijke groet, Ernsthttp://www.pigment-print.com/spectralplots/spectrumviz_1.htm
December 2012, 500+ inkjet media white spectral plots.