[gradsusr] Error on printim with bgImage

[Miquel Bernis]

Hello,

I get an error while tring to create maps with a bgImage. When I try to use
a .png background image using this command:

printim vent036.png -b mapaBase.png -t 0 x630 y486

I get the error:

PRINTIM error: background image open error

I've checked the path, so the problem isn't that. I've tried saving the
background image with different .png options, but the problem remains. I'm
only able to generate a map with a bgImage when I use one of the other maps
I've created with GrADS. In that case the command printim returns no issues.

I'm using v2.0.a9

Please tell me if you have any idea about which would be the problem.
Thanks in advance for your help.
Kind regards,
Miquel
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