There are many different techniques and ways of creating a selective color images in Photoshop, let me show you the one where we use the black & white adjustment layer.
For a lot of fonts there is not an Italic type option available by default, but there is still a neat Faux Italic Photoshop option that can turn any font into an Italic type.
A simple Photoshop tutorial, where you may learn how to expose an object by leaving it in color while turning the rest of the photo black and white or sepia.
