There are many ways by which you can change the background of a picture. There are many types of software which allow you to do it. Still many people ask that how to change background of a photo. People, who are professional photographers, know such ways. They take advantage of their knowledge and charge you quite some money for you lack of knowledge. There are many ways by which you can change the backgrounds, so there is no certain answer to how to change background of a photo. Some use adobe Photoshop while others use chroma key software.
Even in Photoshop there are many ways by which you can change the background. It depends on the individual as to how they want to edit the photograph. Tools like healing are answer to how to change background of a photo as well. If you are using chroma then you would need to have the picture taken with a green background. This is basically what professional photographers do. They would give the child a prop. The prop depends on the answer of the child that what they want to become. Once the picture is taken, the photographer simply places the photo in the habitable environment. Software is not the only answer to how to change background. You would need quite a lot of practice to get your hands on such tools or softwares.
If you want to become a photographer, then taking pictures for children is something you need to get used to. In order to do that you need to know, how to change background of pictures. One of the best ways to take best pictures of a child is by knowing what they want to become, as mentioned above. Once you are on the professional level, you would not be asking how to change background. You would want to know that what the background should be. If the child is interested in harry potter or any other related movie, then take the pictures of streets which look similar to private drive or etc. themes are also something which you can use to your advantage. Using normal themes are not an answer to how to change background. You need to make new themes, which would not be available anywhere. Keep in mind that once you satisfy your customer then they would surely return to you and recommend you to other people as well. It is not only the children which make you want to know how to change background of a picture. Couples also have certain demands which involve romantic or amazing backgrounds.
If you really want to learn that how to change background then take tutorials over the internet. Learning adobe Photoshop would be the best thing for you. This would allow you to do much more than just how to change background. To the moment, Photoshop is the only software used by each and every professional photographer. If you can imagine it, then it can be done by Photoshop. There are some companies which offer such services. You can hire them, or save your money by learning how to change background, yourself.