private static ROI convertMask(Mask mask) {
        logger.debug("Converting mask {} to QuPath rectangle ROI", mask);

        // I don't know why width and height are doubles...
        // since we don't have the scale info here, I assume square pixels & try to figure out
        // the required transform
        var binData = mask.getBinData();
        long nPixels = binData.getLength().getValue();
        int width = (int)Math.sqrt(Math.round(nPixels * (mask.getWidth() / mask.getHeight())));
        int height = (int)(nPixels / width);

        if (((long)width * height) != nPixels) {
            logger.warn("Couldn't figure out dimensions: {}x{} != {} pixels", width, height, nPixels);
            return null;
        }
        // Create an image we can pass to ContourTracing
        var array = binData.getBase64Binary();
        var simpleImage = SimpleImages.createFloatImage(width, height);
        for (int i = 0; i < nPixels; i++) {
            if (array[i] != 0) {
                simpleImage.setValue(i % width, i / width, 1.0f);
            }
        }

        // Create a request we can use to calibrate the ROI
        // We're assuming x and y are integers and that there is no other transform!
        var request = RegionRequest.createInstance("", 1.0,
                mask.getX().intValue(),
                mask.getY().intValue(),
                simpleImage.getWidth(),
                simpleImage.getHeight(),
                ImagePlane.getPlane(mask.getTheZ().getValue(), mask.getTheT().getValue()));

        return ContourTracing.createTracedROI(simpleImage, 1, 1, request);
    }