make multicolor images

[mezwick]

Thanks for all your work on spatialdata and napari viewer.

Unless i have missed it, one missing aspect i would like is the ability to make multicolor images of image elemtns in spatialdata objects, within the spatial-data napari viewer plugin. So far as i can tell, this is not possible.

Expected behaviour

1. Load spatial data in napari with spatialdata plugin
2. Select coordinate system, load image element
3. Select a channel, adjust colormap and contrast limits
4. Select another channel, repeat step 3 until showing all channels as one would like
5. Have multichannel view of image, on which can overlay mask elements

Issue
Selecting a second channel, resets the whole image. Can only view one image at a time

Potential solutions
Option to load channels as individual image layers?