Mask color array

[manics]

See https://github.com/ome/omero-ms-zarr/issues/62 Converts the label-color dict to an array or colours.

Also require the labels to be integers

See also an alternative in https://github.com/ome/omero-ms-zarr/pull/68

[mtbc]

Note that the microservice uses ROI IDs as pixel values for overlapping masks.

[manics]

I thought it was going to use a sentinal value e.g. -1 or max-int?

[joshmoore]

That's masks per ROI rather than two overlapping ROIs. To reduce the ambiguity, using the ROI ID everywhere might be safer (Rois and Masks could have the same ID).

[manics]

Using ROI-IDs instead of integer labels makes it easy for omero-ms-zarr and other utilities to export the mask from OMERO, but it means a user has to map each ROI-id to a label-index if they want a traditional label image.

[mtbc]

It would be easy to make that configurable. It would be possible to wholly prohibit offering ROI ID pixel values, I'd naively guess that the ROI→index lookup would be fast, but if their code is thinking in OMERO ROIs then of course they have to map the indices back to the ROIs.

[manics]

I've made a second proposal in

• https://github.com/ome/omero-ms-zarr/pull/68
• https://github.com/ome/omero-cli-zarr/pull/24

[joshmoore]

Closed in favor of https://github.com/ome/omero-ms-zarr/pull/71