Hi Mike, A little while ago I wrote on the Argyll CMS mailing list with questions about using the DTP-22 and you mentioned that you had one, but you had not yet been able to achieve acceptable results with it when profiling your inkjet and dye-sub printers. I have now got a DTP-22 and I have just tried it out for the first time this weekend. I have not used with Argyll CMS yet (although I intend to try that out sooner or later) but I have been using it with the Onyx RIP I use on my HP large format inkjet printers. So far I have calibrated my Designjet 2500CP machine using a 31 point per colour linearisation pattern and a 500 point ICC profile pattern, and although I have encountered a few problems, which may go away once I become more familiar with the profiling method, the results are initially extremely promising. The output is far better than anything I have ever seen on my Designjet printers, and that was just my first try with only a 500-point ICC profiling pattern (the Onyx media profiling software recommends using 1000 or 2000 points). I had a bit of trouble setting the ink limits correctly and I think the profile may be inaccurate in the very dark colours, but I suspect that this might improve once I redo the ICC profile with more points and corrected ink limit settings. I also had some trouble with the colour of the paper, which for the media I have been testing with so far, came out as noticably cyan, even though to the eye the media looks white. Therefore it was compensating by making the output more red, which looked wrong; first instance neutral greys looked slightly red, even though the DTP-22 read them as exactly grey. But by changing the parameters for the ICC profile generation I was able to prevent it from applying this compensation, and the result then looks correct to the eye even though it reads wrong. I am not sure exactly why this is, but presumaby the eye compensates for the cyan hugh of the paper and makes it look white--either that or my DTP-22 is reading wrong. But I tried reading some other paper with it, and while most of the papers I tried seemed to have a similar cyan bias according to the DTP-22, there were several which were exactly white--so I guess the papers really do vary and you just can't see it. So at this stage, this is just to say that it definitely is possible to make useful profiles with the DTP-22, but clearly it requires some knowledge of how best to use the tool. Once I try it out with Argyll (which I want to use for profiling my Epson printer which does not use the Onyx RIP) I will let you know how I get on. In the Onyx media profiling software, there is a test tool which lets you take readings with the DTP-22 and display them either as CMYK densitometric or LAB colorimetric values on-screen. This is quite useful for checking that the device basically works and reads colours correctly. I imagine the Argyll system (or the colorport software you are using) no doubt has a similar test tool. I presume you have the calibration target for your DTP-22 and that you have calibrated it? Using Onyx, after calibration it then reads the calibration target density as 0.04 in all the channels. Before calibration, my DTP-22 was completely wrong. I think that to test your DTP-22 and find out whether it is working properly, the best way would be to get an IT8 target, which should come with a sheet showing the actual colorimetric values for each point. You can then measure these with your DTP-22 and check whether the readings are as expected--this would clarify whether there could be a fault in your DTP-22 or whether it is just the profiling process that is going wrong. I intend to try this out myself just for curiousity's sake.