Making a black & white photo from a colour photo.
This is the original photo:

In photoshop CS there is a standard way to make it black and white:
Go to image, mode and select grayscale

This way, you always get the same result. Every colour is translated to a fixed amount of gray. With my method, you can give every colour It’s own translation into it’s own value.
If, for example, you want the sky to be relatively dark, you can define the blues to be darker.

or you can do the opposite, make the blue from the sky light, and the reds very dark:

Method:
Image, adjustments, hue and saturation.
Pull the middle slider, saturation, completely to the left. Now you have a black and white photo. But in this photo, you can control the different colours if, in the menu where it says “master” you pull down the other colours and make adjustments for every colour using the “lightness” slider. Some adjustments are quite subtile, but this way you have more control over the outcome for every colour.
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