Bitmasks or image patches associated with an segment of a source labeling are again images with certain dimensions (depending on the labeling they where extracted from) and pixel type (a bitmask is of type BitType). Furthermore, especially important for a re-composition of bitmasks or images patches to new labelings or images (see next Section 3.8 for more details), each image has an offset/minimum. It is the position that the upper left corner used to have in the original image. ’Normal’ images, as those read in with the Image Reader-node, usually have an offset of 0 in each dimension.