It’s common to shoot business portraits against seamless background paper. It’s also common practice for a photographer to create a tonal gradient on that background rather than having a flat tone. A gradient adds a bit of depth to the photo by separating the subject from the background.
The problem with a tonal gradient is that when the finished photo is saved as a jpeg, the file compression can cause the gradient to posterize. The amount of posterization also depends on how “steep” the gradient is.
A small amount of posterization won’t be noticed by most customers nor will it be visible in print or online. But many photographers want to deliver the best possible image to the customer.
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