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.
Basic Photoshop tutorial for everyone where we will open any color photograph and then with a little trick create a nice gradient color transition to black and white.
Let's design a stylish and transparent discount label you can then use for an online shop website, posters and similar media you want to advertise a discount on, using Photoshop.
If you don't want others to use your photos and images without your permission, you can create a so called custom watermark with your name or any other text you want.
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.