[argyllcms] Any guidelines for creating scanner profiles with Argyll?

I'm not sure which targen options to use since this is a RGB 'device' but
it's not a 'Print' RGB or CMY device. Is it 'Video RGB'? For sure it isn't
CMYK. 

Also, when looking at profile options, I fail to find an option to not
create the B2A tables since an input profile only has A2B tables.

Kindest regards,

Roger Breton

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