GIMP PDFs have transparency

[waltonm]

Thank you all.  

From the answers above, I assume:

• Transparency is an artifact of how GIMP exports to PDF.
  
• There are no settings in the process that can prevent it.
  
• There is nothing that can be done to the source file--flattening, merging visible, export to JPG--that can prevent it.
  

Several people have said that GIMP won't work for me.  This has nothing to do with me.  I am trying to provide advice to the many people who use GIMP to help publish their books on KDP.

Thanks again,

Walton