When a user uploads an RGB photo not tagged with a profile, does the system automatically convert it to sRGB IEC561966-2.1 (for example) based on the SPS Application Settings?
If you don't set "preserve_colorprofile=true," UGC automatically assigns RGB Color profile. This profile is the default behavior of the conversion program that UGC uses for image conversion.
You can find details on the options that can be set at the time of uplaod here:
http://help.adobe.com/en_US/scene7/using/WS1c46793299cf21d7-2aa69c37131f39ca366-8000.html