ImageMask.data created by open_mask returns all zeros

[digitalspecialists (RobG)]

@sgugger

Just pushed a change to open_mask and SegmentationDataset . It now expects masks with zeros, ones, twos etc… and if it’s zeros and 255s we can set div=True to make the divide happen.

It looks like the recent change 1cd9e68 removing div=True has stopped my 255 masks from working. Is there a new way to tell the SegmentationDataset that my binary masks are 255/0 or should I make them 1/0 at source?