[argyllcms] Perceptual Source Gamut

I want to build an RGB profile with a perceptual table. The documentation says:
"In order to generate perceptual and saturation intent B2A tables, it is necessary to specify at least one profile to define what source gamut should be used in the source to destination gamut mapping. The -S parameter is used to do this, and doing so causes perceptual and saturation tables to be generated. If only a perceptual intent is needed, then the -s flag can be used, and the saturation intent will use the same table as the perceptual intent. Note that a input, output or display device profile should be specified, not a colorspace, device link or abstract profile."
I have a collection of several thousand automotive catalog images. These are mostly hybrid images (compositions of CGI and photographs). They are in RGB format, tagged with Adobe RGB 1998.
What is the best way to obtain the source gamut profile described in the documentation, above? 

-Bill
--

William B. Birkett - <wbirkett@xxxxxxxxxxxxxx>
Print Quality Consultant
Doppelganger, LLC  - http://www.doplganger.com/

48799 Meadow Drive, Plymouth, MI 48170 (USA)
Office: (734) 927-4232      FAX: (734) 468-0580
Cell: (734) 516-4790

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