hey! I'd like to print and sell my photographic work. I'm working with Lightroom and the highest quality I can export is the TIFF format. However, I found this online company that acts as a 3rd party between my website and the printing companies worldwide (www.peecho.com). They take care of the printing and shipping once the customer click on a link on my website. it's pretty well made except that they don't accept the TIFF format. PDF would be the best choice, but after hours of commotion, I cannot manage to export my TIFF to PDF (tried many different ways, such a Print as PDF, Photoshop conversion, and other softwares.) Every time I do so, the resolution switches from 4000x3000 pixels to something way smaller. the file size goes from 70 mb to 10 mb... it seems that the industry accepts widely the PDF as the HQ file format... what am I missing? thanks to all!