first off, my apologies for the delay in responding.
<quote>Rereading, don't see this as viable approach. Difficult to "integrate"
whatever external libs are available by os/DE--and then issues for consistency
<quote>Which is a show-stopper.<quote>
Okay. I leave the approach to whatever the developers deem best. All I know is
that GIMP, Blender, Krita, Inkscape, Scribus, etc. all have a
pipette/eyedropper tool. I don't presume to know how those applications have
integrated said tool but it leads me to believe the problem is not surmountable
nor novel technology.
<quote>IMHO => WF</quote>
Well, then...that settles that. Thanks for your time.