Adobe Acrobat 7 Professional - Manual (Page 596)

About embedding color profiles
You can embed profiles that describe the characteristics of the document's color spaces.
Acrobat attaches the appropriate profile, as specified in the Destination Space area of the
Convert Colors dialog box, to the selected color space in the Adobe PDF document. For
example, a document might contain five objects: one in Grayscale and two each in the
RGB and CMYK color spaces. In this case, you can specify that Acrobat embed a separate
color profile to calibrate the color for each color space, for a total of three profiles. This
might be useful if your RIP performs color management of PDF files or if you are sharing
PDF files with other users.