I am working on publishing a book on Lulu. One warning it has about my PDF is:
Images: Your file contains images with line thickness less than 0.14 points. This may be too thin to print. Please review your file.
I have all of the EPS files that go into the book. However, I do not know how they were created, so I cannot edit the originals. Is there a way to edit the EPS directly to make all lines at least 0.14 points?