Identification photos are largely needed in our daily life. When I was in university, I often take photos by myself and develop them at print shop. It is simple to realize; just stand before a white wall and ask your friend to press the shutter. Both time and money are saved. And for product shots for a catalog, it looks better that way.
It seems extremely easy in theory while it takes a lot of experience or a lot of slow and tedious work. First, you need to understand what doesn’t work and why. You can’t put something in front of a white wall, take the shot, and expect the background to be white. It won’t be. Instead it will be some shade of gray. But it is possible to make this work with just two lights – one for the subject and one for the background. If the subject is very large, you will need at least two lights on the background. The main thing is you have to pour a lot more light on the background than you do on the subject.
Next, turn on your background light or lights. You want it to fill the visible area of the background that will show in the image. Take a picture again and look at the image in your LCD panel. If your camera has something called highlight warnings (commonly “blinkies”), turn that on. If the background is properly exposed, then the entire background will be blinking and the subject will look well exposed. Once you get to that point, you are done and you have a perfectly lit subject on a white background.