Photoshop will not print to EpsonP900

Epson / Mac: Add printer, AirPrint issue, here are some notes about Apple’s built in (default) Gimp Print / Gutenprint based printer drivers.

Best avoided.  It can print quite differently from the manufacturer's own driver software. 

Does the print driver look different? some options have changed?

Are media names the same as previous drivers you've used, e.g.. is 'Premium Luster Photo Paper' mentioned or are the media types just simplified names like matte or gloss? 

You'll be aware, I'm sure, that the selected media name in the driver must match the selection made when printing ICC profiling patches, (so the ICC profile and media type selection are linked) . BUT is the media name selected previously actually there in the list?

IF the media names listed differ (and have been simplified) then you are perhaps inadvertently using Apple’s default Gimp/ Gutenprint driver rather than Epson’s own. It's not just a matter of installing Epson driver software, you have to select it too. I do know it's very important to use Epson's own driver software. I tripped over this myself on a client site, the driver looked different and I put it down to an OSX update imposed style - took a while to work that one out.

Here's an example of what I'd expect to see in an Epson driver for media name options:

Can you access print settings in an application other than Photoshop, try Preview?

If not, a thorough purge may be in order, perhaps install drivers (downloaded from Epson) again: 

1. Delete all instances of Epson printers from 

System Settings (or System Preferences depending on Mac OS version) / Printers & Scanners -or- System Preferences>Print & Fax, whichever you have.

2. Then go to /Library/Printers and trash the whole Epson folder.

3. Delete the Epson LFP Remote Panel (IF you are using that utility).

4. Then go to Epson online and download the printer drivers yourself.

Do not let the Mac install the printer driver for you.

There’s one more tripwire - in System Settings (or System Preferences depending on Mac OS version) / Printers  - - - , when adding the connected printer

[i.e. click the padlock, enter your password and click the “+” button]

- watch out for the “Use" selection - I recommend you do not select "Airprint" there under "use", but, rather, manually set "use” to the printer name, which will then call on the manufacturer’s own software rather than the default Apple driver (that’s based on Gimp Print / Gutenprint, which misses out some printing options such as specific manufacturers media names). 

I hope this helps

neil barstow, colourmanagement net  - adobe forum volunteer - co-author: 'getting colour right'

google me "neil barstow colourmanagement" for lots of free articles on colour management

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@cjphoto3063 also make sure you are on the right network connection. I have two set-ups (don't ask), and I always forget to switch over to print on the right connection (i print wireless wi-fi)

Addendum to earlier post: other apps print to the epson with no problem.