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.
If you are mostly using only one resample image option when resizing images, then you can change the default option to the option you are using the most.
A fun graphic design tutorial, a bit longer but still quite easy to follow. We will end up with a stylish looking, ink dripping smiley face. This is part one of the tutorial.