I'll take a wild guess that there is some sort of aliasing happening in the 
conversion process.

In Lightroom I can print to a file, do you get the banding if you print to a 
file rather than export to jpeg?

On July 2, 2019 10:53:22 AM PDT, Steve Cottrell <[email protected]> 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.
>
>-- 
>
>
>Cheers,
>  Cotty
>
>
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