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[LoneGoose]

Oh yes, and another thing:

I don't know how all the digital presses out there work, but most of them have some sort of internal, in-line, either pre- or post-fuser scanning device (usually densitometer I would assume) for keeping the press calibrated; which may or may not need to be supplemented by the operator scanning some test sheets ever now and then.

In theory then, the press is calibrated bringing it back to some stable state and then the jobs are run. Because there is no ink train you don't worry about bringing the press up to colour for each job. So there is no need for colour bars on your sheet - they're just a waste of toner.