int[] pix = new int[engine.getPixels().length];
// make sure the pix default to being white
engine.resetPixels(pix);
mapperWorker = new MapperWorker(colorQueryPanel, connection, params, params.getDataInfo(), evt.getData(), pix);
ProgressMonitorINF mp = new ProgressMonitor(this, mapperWorker);
setVisible(true);
}