Rather than conducting experiments, I have all day struggled with the basics.
I have taken the white balance from the second-whitest patch of the CC24, then used this as the custom WB for shooting the QP target.
Opened in ID, displayed through my normal profile, which is linear and everything zero, and WB as shot, the white patch of the ColorChecker reads 124/114/96 in the Digital Color Meter. The WB is displayed as 5200K/+7 (DNG estimate). If I set it to 5000K/0, it gets a little better, 124/114/96. If I adjust the WB so that the RGB curves are adjusted to the same max value (that they end the same place in the right side of the histogram) then the values are 114/113/106. The WB is then displayed as 4407/+7 (DNG).
The DigitalColorMeter reads the values that the screen displays, so my calibration may be the culprit. But where do I find the values which are actually in the file? ACR and PS CS5 display similar values.
I can not shoot the target better than I did. Is the Canon swallowing Blue?
WRT Iridient Developer, the result so far is:
When I first tried, ID displayed the profiles in the profiles selection list. But I could not identify them, because: QP does not enter the name under which you save the profile in the Profile Description String. Instead, this string is always set to the name of the camera, in my case "Canon EOS 5D Mark II". At least this is true for ICC profiles - the ColorSync utility can not open DNG profiles, so I don't know.
Because ID does NOT identify profiles by their Finder name, but by the Profile Description String, it displayed these profiles as "Canon EOS 5D Mark II", "Canon EOS 5D Mark II 01", "..02" etc.
So I could not identify the profiles when I was to select one.
So I tried to put only 1 profile at a time in my profiles folder.
This implied some fiddling to and fro, re-launches of ID and re-starts of the Mac.
At some stage in the beginning, when I tried to select a profile, ID could not open it - but that was true for both DNG and ICC profiles created by QP. Now, ID does not even display them any more in the profile selection list. Understandable enough, it may have gotten confused by identical names for different profiles.
That' s the harvest of today...
BTW note that QP does not let you choose the rendering intent - it's Perceptive. So I will not go on with the QP software. If and when I get the time, I'd like to try the QP target with Argyll.
Good light (and good night) - Hening.