(10-04-2019, 07:17 PM)GeorgeG Wrote: Attached is my xcf file
Not much wrong with the xcf file. I did notice that:
1) the running man is on a white background. Do Colors > Color To Alpha on that layer.
2) the running man is on 2 layers ("running man" and "Knobs"). Delete from the "Knobs" layer.
Your backgrounds look fine in the xcf. 100% opaque. I suspect the translucent effect is in the printing process (printing a colour on transparency) and not in the xcf file. You will need to look at the printing process to see if anything can be done there.
Edit: Perhaps try printing on opaque white rather than transparent film.