There’s a nice article by David Clapp in Amateur Photographer (Edition of Saturday, November 1st, 2008, but it came out last Tuesday the 28th October) describing how to make black and white versions of images.
It involves making an adjustment layer (layer, new adjustment layer, channel mixer), checking the monochrome box and moving the sliders (keeping the totals to 100%).
Then open another adjustment layer (layer, new adjustment layer, color balance) checking the shadows radio button and adding around 5% blue and cyan.
Then, in the same color balance layer, check the highlight radio button and increase red and yellow by about 5%.
Another way to make an adjustment layer in CS3 is to click on the little half black – half white circle at the bottom of the layers palette and choose the appropriate option.
I tried it and found that by moving the sliders beyond the amounts recommended in the article, is an easy and elegant way to alter the overall colour tone of an image. It is easier and offers most control than converting to Black and White and then to duotone.
Sheep in black and white