PDF export file size

[pburki]

Hello,

I have a problem with exporting an Affinity Publisher file into a PDF: the size of the resulting PDF is oversized. If I export 1 page of my book, consisting of 2 photos, using the PDF for print preset:

I get a PDF file of 38MB. If I export the same page as a jpeg at 300 dpi, I get a 9.2MB file. When I compare the 2 docs, it seems that the quality of the image in the PDF document is greater than the resolution of the JPEG. Any idea of what I am doing wrong ? My full book of 144 pages must be below 1GB (it is about right if I export all pages as JPEG, but I get a file of 36 GB when exported as PDF).

Thanks

Philippe

[lacerto]

Obsolete.

[pburki]

Thanks. Yes, the source file are 16-bit images. Does the fact that the source images are TIFF also is a problem?

[lacerto]

Obsolete.