Embedded profiles are ICC profiles that are embedded in your image (making them an Input/Source profile). Profiles may have been embedded by devices such as a scanner or digital camera. Profiles may also be embedded by an application such as Adobe PhotoShop, Nikon Picture Project, Adobe InDesign, etc. ImageNest has an option for recognizing embedded profiles and it is what we recommend as a default. In general, if an image has an embedded profile you should choose to use it.