I built a spectrophotometer (https://www.dpreview.com/forums/post/60459110) and
one of things I'll try with it is to produce printer profiles for my Epson P800.
I have collected data from a chart that I produced from ColorPort. I have the
table of RGB coordinates for the patches that I sent to the printer. I have 10
nM spectral data results, and also the XYZ and L*a*b* values from the spectra.
I could assemble an Argyll TI3 file in a spreadsheet (since chartread() is not
an option for my device ).
I have a sample TI3 file available for my pattern to follow but I have some
questions:
* In https://www.argyllcms.com/doc/ti3_format.html I see that I could ;
select between COLOR_REP = iRGB_XYZ or iRGB_LAB; how do I choose?
* I presume that the data line shall contain both the {R, G, B} command
vectors that I sent to the printer for each patch, along with the set of
measurement results that I collected from each patch. The spectral bands seem
like they would be the most useful of my available measurements; is there also
any value added by including my {X,Y,Z} or {L*,a*,b*} triads as well?
* If I do need to include XYZ and/or Lab values, I'd like to try the option
of having Argyll compute them instead of the ones that I've calculated (in case
of possible bugs in my program). Which Argyll function is appropriate for that?
* My spectral data starts off as being the simple reflectance % for each
spectral band, in a flat response as if I had obtained that data under the
hypothetical illuminant E. Am I correct in assuming that I should convert to
the D50 illuminant?
* What are the meanings of the keywords SINGLE_DIM_STEPS, MULTI_DIM_STEPS,
and FULL_SPREAD_PATCHES?
Thanks in advance for any guidance.
- Tony
