In article OtgWd.44700$xt.33304@fed1read07,
says...
Hmm, don't see much difference. By the way, I'd have to disagree with you
on the thought that the B&W mode is ineffective. I get results with my 20D
set on B&W with the yellow "filter" and contrast at +1 that emulate Ilford
XP-2 very closely.
Example: (nude warning...)
http://www.shadowcatcherimagery.com/KitchenNudeNo2.html

Now you're cooking with GAS!