The aim of the Gaussian Brightness Correction is to balance bright and dark regions in the image.

The Sphere Radius controls the size of the region, in which the correction is applied. The Gaussian Brightness Correction works for all types of brightness variations if the grain diameters are small in relation to the Sphere Radius :

The Correction Method provides the two options Multiplicative and Additive. The choice of method depends on the processing applied by the image acquisition device. The scanned image data usually provides information about whether the acquisition device uses linear or logarithmic image processing. If the processing is linear, use the Multiplicative correction method. If the processing is logarithmic, use the Additive correction method.

Click Apply to use the Gaussian Brightness Correction according to the given settings.