[StephenBatey]

OK, here are a few brief hints. If you want to know why, you'll have to ask. In general, people don't want to be bothered with reasons.

1. Convert using channel mixer. Never use desaturate or greyscale.
2. Convert selected parts of the image, never the whole at once.
3. Use layers so you can use the colour data later for selections. (OK, I gave a reason - sorry!).
4. If you want to bring out the texture in sand or snow, use levels (selected area only).
5. Always use curves on at least some parts of the image.
6. Darken corners by about 10%. If you can see that you've done it, you've overdone it.
7. Watch the outlines of objects. Differences in colour will disappear in black and white.

And if someone can tell me how to put up a few piccies, I'll provide illustrations. Otherwise, PM me for a link to the online version of the book I'm writing and from which the pics would have come anyway.