The advantage of using Alpha Masking, is that the designer would be in a position to select a single color tone and then apply a mask based on that. This is extremely useful in situations where colors look similar or not so clear. For example, making a selection of smoke can be done easily using this Alpha masking or channel masking method.
This is one of the way for masking. We maximum time use layer masking for work required or if any client requirement using layer masking work there image. That’s time we worked for client satisfaction and we delivered psd, png, jpg file format.