2015-02-06 by richard@...
I should have clarified, when printing from Adobe Color Utility or (QTR) PrintTool, you do so because you do not want to introduce color management of any kind. You want the RGB values in the ink separation images to be exactly as they are without any translation so the individual ink channels will fire separately. These are the same values that the printer uses internally to print the nozzle check patterns.
At some point around 10.6 Mac and Photoshop started feeding all images to the printer with some color profile assignment behind the scenes. That is why Roy created (QTR) PrintTool for the Mac.
Hope that helps.
Richard Boutwell