Digital BW, The Print

Hi I have posted this question on the Adobe Mac Firums and at Rob Galbraith's site with no 
luck.  I am wondering if someone can help me.  Given it is off-topic please reply directly to 
me rather than on-list.  

I am a bit puzzled by Photoshop's Gamut Warning. I would have thought that this would 
not be rendering intent specific. That is, I would have thought that the ICC profile used in 
the soft proof would describe the gamut of the proof and that gamut warning would 
simply show which pixels are not inside that gamut. When I use gamut warning I rarely 
find any pixels highlighted unless Absolute Colormetric is used as the rendering intent. (I 
had to pull up the Granger Rainbow to see any out of gamut pixels with the other intents.) 
For example, if I select relative colormetric, does gamut warning not show me the pixels 
that are clipped to the closest possible hue? I am struggling to see how absolute 
colormetric's dealing of white point vs relative colormetric would produce more out of 
gamut pixels. Aren't they either simply in or out?  

And why is there no gamut warning ability for B&W to highlight which pixels (down in the 
deep blacks and highlights) can't be reproduced because of the limits of ink black and 
paper white?

Thanks 

Steve