Could someone elaborate on why some printer profiles have very weak black when using relative colorimetric rendering intent w blackpoint compensation compared to the same profile/paper combination with either perceptual or relative without bp comp? Is this because relative colorimetric w bpc maps the source black to the darkest neutral color the media can achieve and perceptual maps source black to the darkest color (max density, neutral or not) the media can achieve or is it perhaps because of a bad profile?
I've seen this especially with some canned profiles for matte papers and the differences are sometimes huge but also to much lesser extent with some custom profiles for E7800/premiumgl. The effect is seen similarly in print and softproof and the numbers going to the printer are very different (extreme case: source 0,0,0 -> relcol bpc 20,20,21 compared to perceptual 0,0,0).
Thanks in advance,