OpenRefine: Displaying Images in cells: by https://groups.google.com/forum/#!topic/openrefine/4E2JqYHxZB8/discussion

cell-ui_IMG.js

//Assuming that you're using version 2.1, then you could dig into the Javascript source code of your Google Refine download and hack this feature. Take a look at this file and line:

//http://code.google.com/p/google-refine/source/browse/tags/2.1/main/webapp/modules/core/scripts/views/data-table/cell-ui.js#75

//You would want to change it to something like this

        } else if (URL.looksLikeUrl(cell.v)) {
            if (cell.v.endsWith(".jpg") || cell.v.endsWith(".jpeg") || cell.v.endsWith(".png")) {
              $('<img>')
                  .attr("src", cell.v)
                  .attr("href", cell.v)
                  .attr("target", "_blank")
                  .appendTo(divContent);
            } else {
              $('<a>')
                  .text(cell.v)
                  .attr("href", cell.v)
                  .attr("target", "_blank")
                  .appendTo(divContent);
            }
        } else {
            ...

//David