The video below demonstrates how to perform background subtraction, through annotated click-through text.
A couple of questions have come in, on how to best perform background or blank subtraction.
QualBrowser has a native tool to perform this task.
Please see the video below, on how to perform the operation on a single sample or a batch of samples using a .sld file.
If the video is blurry please click the cog wheel at the bottom of the panel and increase the video display resolution.