Dear #photographers & visual #artists running #Linux, what are your tricks for #colour -accurate #scanning photo prints on consumer-grade gear (not a film/drum scanner)?

I have 3+ #scanners, all with wildly different #color results, as you can see below. At least 2 of them can scan directly over LAN (in Simple Scan).

Ideally I'd want #colormanagement / calibration of scans, ideally with "Simple Scan" (otherwise, how do you do it with XSane?). I have a ColorMunki spectrophotometer, if it helps.