Linux running flexdash Node-RED 3.02. How can you reference an image on local disk vs. URL?
You can't. Your web browser has to be able to fetch the image, hence it has to be a URL. You need to configure NR so Node-RED's web server (e.g. the static content) has access to the image (e.g. by copying the image into the static files area). Then you can use the resulting URL.