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If the DTP24 is supported by colorport, you can use that to create patches read them in and save the data as a CGAT file. Which you can then bring in to Argyll (use the logo2cgat utility to create the ti3 file to use in colprof)Colorport can be downloaded from xrites website
Thanks, Steve. I actually did try that a year or so ago, and failed. The resulting profiles were very puzzling - large delta E values and a very glitchy profile. I am not experienced enough to debug the data trail to see which patches, if any, were incorrect.
