Thanks, it appears to be that, do you know why open_image does that [0,255] instead of 0,1? My images are saved as 1bit with PIL.
This solved the issue:
class MySegmentationLabelList(SegmentationLabelList): def open(self, fn): return open_mask(fn, div=True) class MySegmentationItemList(ImageItemList): "`ItemList` suitable for segmentation tasks." _label_cls,_square_show_res = MySegmentationLabelList,False