CellMap data not displayed with color map

[johnkit]

In the janelia_cosem_dataset.ipynb example notebook, the dataset (jrc_hela_1) is displayed as a grayscale block, with the color map apparently ignored.

This seems to be because the data type is uint8. As a check, I added a float32 column to the Xarray dataset by adding a line to the end of theopen_cosem_dataset() function: ds["fvalues"] = ds["values"].astype('f4') . The new column fvalues is color mapped as expected.

Ideally, we should update Pan3D to apply color to integer data, or at a minium, update the example notebook to add a floating point column for the default display.