Changing a colour photo to black and white.

How do I change a colour photo to black and white? I'm embarrassed to ask this but I've spent about an hour going through everything and even looked at the help page. I bet its so simple but I just cant work it out.

Thank
Steve.

2 ways: 1. image-> adjustments-> desaturate.
2. layer->new adjustment layer-> channel mixer (click ok ) in the dialog box check monochrome and play with settings.

ORRR, Image > Mode> Grayscale

No no no nooo!
Don't use the desaturate function, you'll lose lots of information that way.
Use the adjustment layers for it. You'll have more control and don't throw any image information out.

Don't use the desaturate function, you'll lose lots of information that way.

You could also copy/paste the lightness channel out of lab mode into your RGB file. That gives much better tonal range than most options.

Chang ethe mode to grey sacale. Img>Mode>Greyscale THEN also change the brightness and darkness. Image>Adjustmenst>Brightness/Contrast

This will insure that you bring out the darks and lights.

:D