Plot semantic segmentation multi-class masks on RGB image

I tried using the Visualizer module to plot my predicted segmentation masks (binary channels) on an RGB image, but it seems to require some kind of detectron2 specific representation.

What's the easiest way to plot the segmentation mask overlays if I don't use the detectron2 pipeline for the actual segmentation?

Start with the Visualizer module mentioned in the issue and inspect how it accepts segmentation masks and RGB images. Reproduce the reported mismatch using binary-channel, multi-class masks outside the detectron2 pipeline. Done means the supported path for plotting the mask overlays is clear or the requested support is implemented and verified.

Written by the indexing model from the issue text.