> > There is something I don't understand: how a profile alone can do BPC? I > thought this could only be done by the CMM, using source and targer > profiles... > > Am I missing something? > I'm not sure. As I understand it from the color.org web page and the gamut vrml output, the icc profile with BCP pulls black down artificially to a luminosity of 0. That means, if you use it for your working space, it will make shadows darker than a "standard" sRGB profile. color.org explains it like this: "... Otherwise, the profile with BPC is similar to most common sRGB ICC profiles in use. The profile without BPC produces sRGB colorimetry in the PCS that is more accurate to what a viewer of a sRGB calibrated display will observe in the reference sRGB viewing conditions, especially the dark colors and black point. It should be used in situations where greater colorimetric accuracy is desired, such as for preview and proofing applications, and where CMM color rendering will be applied."