You could try letting the printer manage color, that solved a myraid of problems back when I was still using HP printers.  The Canon gives much closer results to the screen image when I do that since I don't have a dedicated profile for any of my common printing papers.   I sometimes get the feeling the printer is actually fighting Photoshop.

On 7/2/2019 1:53 PM, Steve Cottrell wrote:
Hi PDML

Well, I just nearly fell off my chair.

I have an Epson P50 printer, a few years old and been around the block now, but 
it still works and the separate ink tanks I like, but generally I don't print 
photos from it - it's just the House Printer.

The Mrs announced she wanted some prints doing of photos she had taken so i 
though okay, i better make sure it's gonna work.

Test prints in CS6 resulted in horizontal banding. As I recall, I had the same 
issue way back and tried troubleshooting it at the time and gave up when 
offered a beer. I may have thrown the empty bottle at the printer.

Anyway, a nice A4 shot with plenty of textures and patterns came out shit with 
loads of horizontal banding.

Okay, nozzle check, one or two gaps here and there, cleaning cycles, nozzles 
clear. Still banding. Next, head alignment, and another test print. Still 
banding. Tried adjusting all sorts of settings in Photoshop CS6 to no avail. 
Very slight colour overlapping resulting in discreet but noticeable banding.

Then I had a thought.

I exported the image as a best quality largest size jpeg onto my desktop and 
opened it in Preview (a Mac general purpose photo viewer/editor, comes with the 
OS).

I printed from that and NO BANDING.

Anyone care to hazard a guess where I'm clearly being defeated by CS6 ?

Thanks for all advice.

--
America wasn't founded so that we could all be better.
America was founded so we could all be anything we damn well please.
    - P.J. O'Rourke


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