FileInfo.color not working

[lumostor]

Hi
First thanks a lot for this it is really appreciated.

I'm trying to change the color of layers before to export to PDF, but it is not working, no color change. I"m on kali linux (debian), and python 2.7. Here is the script:

import cups
import PyGerbv

prj = PyGerbv.Project()

drill=prj.open_layer_from_filename("usbasp.drl")
drill.mirror(1,0)
drill.color=(0,1,1,1)
drill.alpha=1

top=prj.open_layer_from_filename("usbasp-F.Cu.gtl")
top.mirror(1,0)
top.color=(0,1,1,1)
top.alpha=1

w=5
h=5
prj.export_pdf_file("usbasp-F.Cu.pdf",  (w, h ))  

Thanks.