Maybe I should give it try to use the sRGB color space as the target space when generating my profiles and see what happens in the perceptual intent when printing
softproofing with the sRGB vs AdobeRGB based profiles using the relative colorimetric intent (NO black point compensation):
No difference using sRGB or AdobeRGB as target color space using the colprof.exe to generate both profiles.
I get this with my makeprofile.bat (using adobeRGB as the reference color space for colprof.exe):
No difference in volume size and white point. Did you compare the other profiles with another using iccview.de ?
I just tried my profile against your "better" profile using sRGB as the reference...
Actually the best way is to buy (expired) violet ink cartridge from LPF Epson printers and suck the ink out with a large syringe: the gamut is way better than the home-brewed "Violet" Inktec Powerchrome ink.
You see I am a complete noob in programming :oops:
Note: the SpyderPrint does supports strip reading, but spot reading is much more accurate and I can scan a 300 patch target faster with my CR30 than more than a decade ago with that terrible Spyder3Print device and still couldn't produce a...
All the files can be found on the topic I started and can be downloaded there including the python scrips and the targets (247, 266, 270 (Letter) and the latest 300 patch target) and argyllcms can be found on the website of argyllcms.com.
Just do your work in finding the files.
I will try to write a compact how-to manual how to create a printer target with the CR30 + ArgyllCMS + Python scripts (thanks to @micronica and others) if I have some time later this weekend
I have just found this link of the manufacturer of the CR30.
https://www.chnspec.net/Spectral-Colorimeter-CR-30.html
It does specifiy: spectrophotometer and look at the spectral range: 400-700 nm in 10 nm steps, which very similar to the 380-730 nm range of the i1Pro2 (also in 10 nm steps)...
I suggest to purchase the CR30 colorimeter (actually a true spectrophotometer). I think the price would be almost the same as your IT8 target and much more accurate (on pair with Colormunki/i1Pro).
The one I have bought...
The software runs on Windows only and needs a com-port: maybe a virtualisation is possible in MacoS. The software is called ColorQC2 and is necessary to capture the LAB-values and the spectral data needed by ArgyllCMS to create the printer profile.