Preface: I have never used photoshop before today. I am on my computer at home.
I have artwork scanned into 1200 DPI .jpg files. I am trying to get my files sized correctly and PDF’ed in the highest quality possible so I can print to the Dye Sublimation printer which can print up to 2400 DPI.
So, armed with that knowledge I created a 11x14 inch, 2400 DPI, RGB Color (16 bits/channel) photoshop file and added my images into it, and resized/cropped them to what I wanted.
HOWEVER, when I try to export or save this file to a PDF either the PDF option is greyed out or simply not there. I have spent a few hours today combing through forums and videos trying to figure out if I have a setting wrong or something and nothing has worked. I have tried several options including recreating the file as an artboard, changing the bits/channel, and trying to just print it to a pdf writer and none have seemed to fix the issue.