What about the non-zero Black point. That would make the L* values on the shadows portion higher than the image values? How does BPC takes affect that?
:Niranjan.
Yes, for instance if the actual (measured) BP is Lab=(5,0,0), and you print the same using Rel. Col., it will measure a bit higher, about L*=6. Rel. Col. with BPC expands the lower end so if you print, say, L*=3, and measure it you will get about L*=8. There is a specification from Adobe included in ICC documents at color.org that details how BPC is implemented.
It's common to enable BPC to prevent dark shadow clipping since Rel. Col. alone only expands the upper end (white point).
Perceptual intent is up to the profile maker's software but common practice is to incorporate BPC as well though some will clip at L*=3. Newer printers often have a very low L* black on glossy media. My Pro1000 comes in at just under 2.0 for blacks.