Feature request: add overlays

[vincenzoml]

Would be great to be able to add overlays, that's it.

[korbinian90]

I like to implement it, but it might be a bit tricky. At the moment the extension works as a "readonly editor" for a file. So currently, it gets only the input of one file.

I think I can create a custom command: "Open NiiVue Panel" and make it persistent. Clicked files could be forwarded to this panel, when it is selected. The first image would be greyscale and the second image added in opaque colormap.

Currently, the data is read from disk by vscode and sent to niivue as a buffer. This is what happens in the rendered niivue html document:

let image = new niivue.NVImage(data, uri);
nv.addVolume(image);

Is there a way to use addVolume and set a colormap?

[vincenzoml]

I have worked extensively with niivue a couple of years ago, so I am not totally sure to give the best answer here, but for setting the colour I'd look at the source code of https://niivue.github.io/niivue/features/colormaps.html

[korbinian90]

update v0.2.0

• new button to select a second image to load as overlay with redyell colormap