Color leak when `outline_alpha=1` and `full_alpha=0`

[LucaMarconato]

Originally reported by @MeyerBender

• normalization of channels: see differences between the two notebooks when plotting all channels but DAPI. I guess it is intentional that no normalization is performed by default, and it should be possible to normalize channels using the “norm” argument, but the documentation isn’t very clear on how to do this properly.

Using outline_alpha=1 and full_alpha=0 leads to plots like this one (notebook here):

Probably the erosion step misses some pixels.

[MeyerBender]

Example code snippet:

import spatialdata as sd
import spatialdata_plot
from spatialdata.datasets import blobs

sdata = blobs()
sdata.pl.render_images(channel=0).pl.render_labels(outline_alpha=1, fill_alpha=0).pl.show()

For some reason this also creates two colorbars, not sure why.