Now you may be thinking to yourself that you can do the same in Lightroom or whichever post processing tool it may be that you are using. This is 100% correct, although you are then limiting yourself. As all RAW images that you import into your post processing software, your images start on ‘0’ with all of the settings as shown on the left below. If you are wanting to create an over exposed image, you therefore have 5 full stops that you can work with in your software, as shown on the right below.
If however, in camera you did not plan to shoot for high-key, and your image came out slightly under exposed, you may find that the exposure compensation in post processing might not be enough for you to work with. Therefore, if you over compensated in camera by say 2 full stops giving you a good image to work with, you end up being able to over expose by 7 full stops (the 2 from in camera, and the 5 you still have in post processing).
This is why it always helps to be prepared in-field, and to pre-plan what it is that you would like to take away from the day or trip, and to ensure that you are able to bag those special photographs.
Till next time!