[argyllcms] spotread filters

Hello All,
 
Sorry if I sound like  newbie, becasue I am.  I just searched through the
archives, but haven't found anything yet.  I was curious about the -F tag in
spotread and/or chartread (-F extrafilterfile Apply extra filter
compensation file).  How does it work, what does it do, and how do I go
about using it?  Is it just a place to specify an .SP file?  Spotread works
correctly with my eyeone so i know that is working.
 
This is the result I get using one of the SP examples from the ref folder,
so I guess its not just an SP file:
 
D:\Argyll\spotread>spotread -c1 -F d50_0.0.sp
 
Setting filter compensation failed with error :'Unsupported function' (No
device error)
 
Any information would be greatly appreciated.
 
Thanks,
 
Jacques Warnon

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