The FillingMode determines how all values, which lie outside your defined region of interest, will be set. This option is only needed if you choose a labeling column, such that the node operates on ROIs instead of the entire image. There are currently four FillingModes:

Value of Source: In this mode, pixels outside of the ROIs remain unchanged.
Minimum of Result Type: Here, values outside of the ROI are set to the smallest legal value of the output image type.
Maximum of Result Type: All values outside of the ROI are set to the largest posible value of the output image type.
No Filling: No action is taken after initializing the target image, thus all pixels outside the ROIs remain zero.

Inverter

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