Also while attempting to entertain myself while reading a chart, I was thinking about what I've read of the ColorMunki and wondered if there're any ideas in there that it might be worthwhile for Argyll to steal.
As I understand, you first read a generic small-patch chart. After reading it, the software prepares another small-patch custom chart based on the results -- presumably, doing the same thing as targen -c. However, when that second small chart is read, the readings from the first chart are also incorporated in the resulting profile.
Then, when you wish to print a high-quality image, you feed the TIFF to the software, and it generates yet another small-patch chart, presumably doing some math that's a combination of tiffgamut and targen -c. As with the second chart, all three readings get merged into the resulting profile.
As one continues this process, the eventual result is a very large patch count profile that targets the particular color palette the user works with most.
It seems to me that most of the pieces for a similar workflow are already in place with Argyll, with the biggest missing piece being merging the results of two or more separate charts into one single profile. Of course, one could manually edit the .ti1 and .ti3 files...but that's an awful lot of work.
Graeme, would this be a practical addition to Argyll? Is there anything to be gained? If so, as usual, can you do it even one better somehow?