Operation: find and subtract background
The operation searches the biggest value around the minima of the image and subtracts it from the image.
Options

radius: The radius that defines the area around the minima in which the maximum backgroound value is searched.
offset: Values upto offset above the minimum are still regarded as minimum.
iterations: The number of times the operation is run..
skip limit: Images for which the given portion of pixels is already zero are skipped.
Parameter
The only parameter is the input image.
Results
The only result is the result image.