differnce between grayscale and adustments..black and white? oh..i just worked that out whilst writing.. one completely removes the cmyk or rgb, the other..leaves it as that..but removes the colour. 

ok.. hints, advice in changing cmyk/rgb into black and white? I got the filter bit..but what would be an ideal black and white image? what do you go for? 

also... in terms of levels and curves..

suggestions, advice, anything gratefully accepted.