Reply To: B&W printing in a printshop

David, thank you for your quick reply and information. It just happens that I used a preset file downloaded from Lulu. Besides, all pages are b&w so why would ID convert the images to RGB?
In any case, meanwhile I also searched Lulu’s forum and found a full spec for B&W files exporting to PDF. Here is the link:
https://x2t.com/Lulu_b-w_presets.
I reconverted my file (pain_in_the_b_t with a 408 pages ID file) and will upload it to Lulu. Hopefully this will work.
Regards
Tom