I am a novice and need help. I am looking to buy the hp z3100. What does the ps do? and what does the APS do? Can they both be purchased later?
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APS is the software package with a hardware monitor calibrator to take the onboard spectro many steps further. It profiles both rgb and CMYK, on site profiles or externally printed charts for other printers all along using a fully automated chart reading in the Z printer.
The quality of the profiles I found on all but matte media were substantially better than the built in profiles.
You can buy it after the fact, yet often it's cheaper to buy the Z PS option which includes both APS and an embedded Adobe PS rip.
Look on my site for more details in my Z review.