Printer Profile Validation: M1 vs. M2 and ΔE2000 Evaluation

[itsab1989]

@jctay thank you for the three files saved with M0, M1 and M2 selected, and for the set with only some of the conditions. They answered exactly what we needed, and ChromIQ 4.3.24 uses them:

• ChromIQ now preselects the condition you chose in i1Profiler. Your files show that SelectedMeasurementCondition "0", "1" and "2" mean M0, M1 and M2, also in the files that hold only some conditions (the M1+M2 file says "1", the M2-only file says "2"). The import window still lets you choose another condition, and it says that the preselected one is the one chosen in i1Profiler.
• Files with only some conditions import correctly. A file with one condition is imported without a question, and the log says which condition it was. A file with two offers only those two.
• XYZ is now worked out exactly as ArgyllCMS does it. You were right that your converter was closer to ArgyllCMS's spec2cie than ChromIQ's import. Small things add up, so ChromIQ now uses ArgyllCMS's method (1 nm steps, its interpolation and its tables). On your 600 patches the difference to spec2cie went from about 0.05 ΔE76 on average (0.1 at most) to 0.00002 (0.00008 at most), for M0, M1 and M2. Measurements already imported keep their numbers; only new imports use the new method.
• While checking this we found the same kind of shortcut in a few other places and fixed them too: Build Profile with ChromIQ's own profile engine when another illuminant or observer is chosen (with the fluorescent illuminants F5, F8 and F10 it was off by several ΔE), the Measurement info window for files that hold only spectra, and new CR30 and FD-9 readings.
• A broken file is refused with an explanation. If a spectrum holds a value that isn't a number, ChromIQ now names the patch by page, row and column instead of writing "nan" into the measurement.

Thanks also for fixing your RoundTrip tool for charts wider than 26 columns.

Download: https://github.com/itsab1989/ChromIQ/releases/tag/v4.3.24

Thanks again for the careful testing!