Hi sebbe,
no I have not made my own test chart. I just thought I could use the full Passport target rather than just the cc24 part. - I have looked at the make-testchart command, it does not answer my question, nor does testchart-ff, which I have used for flat-fielding. -
Well if Anders is satisfied with the cc24, so am I, I guess...
Good light!
The layout.json format currently does not support "complex" layouts like the ColorChecker Passport, so you'll have to satisfy with the cc24 part for now. I've made some simulations and really adding those extra won't make much of a difference as they are in a similar color range so I have not prioritized to support it.
If you want a real difference you should have a target which can do super-saturated colors like the CCSG, but it's very hard to shoot without significant glare issues.
A large amount of patches may be worthwhile if you do high end reproduction work, and then the patches should match the artwork you're copying, but if you make a profile for generic all-around use there's little gain to even go beyond the CC24.
What makes bundled profiles different between manufactures (Lightroom vs Capture One etc) is custom looks and optimization tradeoffs and how they apply the contrast curve, gamut compression etc. The actual target used doesn't have that large impact. DCamProf has it's "neutral tone reproduction operator" that is central to how its profiles looks, and with look operators you can apply some custom changes if you like.
One should worry more about making as well made shot as possible to reduce "measurement errors" rather than having lots of patches.
