Reply #13: I did the "channel mixer" method in Photoshop

[priller]

It seems like a lot of people use PaintShop Pro, so this explanation may not make sense. But the channel mixer is a good way to convert to b&w, because it lets you choose how much from each R,G,B color channel you want.

When I first tried the channel mixer in its default mode (which uses the red slider at 100% -- similar effect to a red filter), the sky looked great but the bridge structures generally did not. That's because they had some red in them, and they ended up being too bright. So I selected the sky, did the channel mixer with mostly red, then inverted the selection to get the bridges and such, then did channel mixer again with mostly blue. That kept the nice sky and kept the structures darker, so they had had contrast with the sky.