On this video Aaron Nace from Phlearn takes a look at creating a white background trully white.
Using a white backdrop is a very common practice in photography. However if you did not perform a correct white balance before taking the picture you might find yourself needing to do that in post processing. Here comes this video which looks at using “Threshold Adjustment Layer” and “Blend-If” which can bring your off-white color and make it a true white.
We have looked at changing colors of objects in Photoshop many times in the past including 3 different videos by Nace on different aspects of colors such as changing skin color, changing colors of general objects (such as cars for example), and a more in-depth look at working with colors for portraits.