Fine white line in the pdf

Ce que j'écris n'a rien à voir avec la question mais j'ai du mal à croire que Victorine-Esther Mangeneau, née en 1821 s'est mariée en 1943, d'autant plus qu'elle est décédée en 1881… 😉

Hi @23480835 , i don’t think it can be the flattening artifacts @Eugene Tyson is referring to because your export is to PDF/X-4 with live transparency. It could be a compression/downsampling artifact—does it happen if you turn off compression? If not can you share the PDF?

These should only be screen artifacts and not affect printing.

There's a few threads on this already if you search the forums

https://community.adobe.com/t5/indesign-discussions/why-white-lines-on-pdf/td-p/8823035

https://creativepro.com/when-you-see-thin-white-lines-in-your-pdf-files/

https://www.thegraphicmac.com/dont-fear-the-white-lines-in-your-pdfs-created-by-indesign/