Question
Unwanted white background when export book as a PDF
When I make a PDF using the book feature, the background of an image is white in all documents except the first document in the book.
If I change the order of the documents, all but the first document have the same problem.
What I tried for the solution;
Save all documents as idml, convert back to indd.
Create new book document.
Give the frame with the problem image an object style. 

