Issue with exporting to pdf for print, taken off compression as it is a large scale print that's required.
The file size ends up being 100mb+ yet preflight in acrobat shows it to be 52ppi, does anyone know why this is and could please help?
Many things affect the final size and resolution of the PDF. Here are a few of the most common ones to check.
I noticed your terminology “taken off compression.” Does that mean you exported with no compression whatsoever of the images therein? If so, that doesn't help you one iota and could be the cause of any file bloat. If your concern is that JPEG image compression is “lossy” then use ZIP compression compression which is lossless (no loss of quality) or even JPEG2000 lossless compression.
The resolution (ppi) depends on two factors, the resolution of the images placed into your InDesign document and how they are scaled within InDesign in combination with what downsampling you specified when you exported PDF.
Generally speaking, following @Bevi Chagnon - PubCom's recommendation for using the PDF/X-4 settings will yield best results as a starting point. 🙂
Always glad to help!