Hi all.

Basically that, which one and why?

Thanks

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B&W, much better results and I believe you retain more pixel information resulting in a better range of tones.

i have a diculty to understand the wuestion but the links lead to beautyfull work 
the web can be heavy to manege because of all the transitions I suppose

I use both options. Depends on what I need it for. I also have a free plug in bundle, Photo Wiz Photo Freebies which has a black and white converter that doesn't change the mode from RGB. I find it extremely useful.

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Really i think it depends on the colors and tones of the original. Either technique could be better in that case. However, here is another way to make a B&W from a color photo that could produce better results Go to the RGB channel palette and click on the red, green and blue channels one at a time, which turns only that channel on. If you see a particular channel that has a nice B&W range 1) select all and copy 2) click on the top RGB channel to turn all the channels back on 3) switch to the layers palette and paste (which makes the channel from step 1 a new layer in B&W

I prefer using the Channel Mixer's Monochrome option to either of these for converting to greyscale.

They had chained him down to things that are, and had then explained the workings of those things till mystery had gone out of the world....And when he had failed to find [wonder and mystery] in things whose laws are known and measurable, they told him he lacked imagination, and was immature because he preferred dream-illusions to the illusions of our physical creation.
      -- HP Lovecraft, The Silver Key