Maybe the 2nd word in the title is redundant. The house printer (HP) died so I set up its replacement (also HP, but smaller). The old iMac already had the HP apps installed so I used it and everything was fine until I printed the test page at the end and it came out in shades of gray instead of in color. Opened some files in Preview and saw the same problem. Driver? Used the info button on the printer itself and the ink levels for the multicolor cartridge were in color. Driver. Driver that the app named HP Smart installed. So here on the MBP I set up the printer via Sys Prefs and color printing works.
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