Am 10.02.2014 05:26, schrieb Graeme Gill: > Oleksij Rempel wrote: > > Hi, > >> I have ColorChecker Digital SG and ColorMunki Photo - will it be >> possible with this device to crate correct CIE and will it be accepted >> to argyllcms source? > > It's possible, although the best way of doing this is to create > a .ti2 file to do the work, similar to the ref/ColorCheckerDC.ti2 > provided with ArgyllCMS. See attached for something that > may work for you. > > You can then just use chartread -p to read the chart. Ok, thanks. > Note though that you will have a file that is right for your > particular ColorCheckerSG, and not someting that necessarily > represents the aim points or batch average for all ColorCheckerSG > charts. Other people have posted such reference files. I don't know if ColorCheckerSG == ColorCheckerDigitalSG. At least it has different branding. See attachment. IMO, since XRight software do not provide any way for setting Version of Colorchacker (i don't think there is good autodetection), all users including Windows, Mac or what ever, use incorrect chart values. I think Agryll can warn users about it, but still provide some reference for those who has no spectrometer. > Note that X-Rite makes available its reference values here: > <http://www.xrite.com/documents/apps/public/digital_colorchecker_sg_l_a_b.txt>, > and there a procedure for converting it to a reference files is given > here <http://www.argyllcms.com/doc/Scenarios.html#PS3>. > > Some people have noted that X-Rite's reference values don't seem > to match actual charts very well. Same about me. Yesterday i was plying with it and gathered my first experience. Here are my notices and questions: * Each reading of same point by spotread -H provided too different results. Some times difference is bigger then this: XYZ: 8.489384 6.420652 10.844807, D50 Lab: 30.449855 22.221768 -21.609957 XYZ: 8.496172 6.425155 10.848450, D50 Lab: 30.460711 22.234237 -21.602624 XYZ: 8.472564 6.406772 10.814047, D50 Lab: 30.416359 22.219140 -21.571466 Probably it makes no sense to use ColorMunki Photo it in high resolution mode. I would say it is device with 0.1 resolution. * May be too high noise ration which i got yesterday was related to room temperature and distance to the room heater * Results between Xright software and Argyll are almost identical, except of permanent 0.2 offset for luminescence. XRight: 30.6, 22.1, -21.8 Argyll: 30.451469 22.147632 -21.731560 Is it critical? * ColorCheckerDigitalSG has part which announced to have same colours as original ColorChecker. I measured and compared some fields of ColorCheckerPassport, ColorCheckerClassic and ColorCheckerDigitalSG. ColorCheckerPassport and ColorCheckerClassic have almost identical results (within noise ratio). ColorCheckerDigitalSG has absolutely different results. For example Violet: Classic(B4): 30.6, 22.1, -21.8 -- comparable to reported results Digital(H3): 20.0, 33.3, -30.4 -- different from reported ColorCheckerSG -- Regards, Oleksij
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