diff --git a/api/index.php b/api/index.php
index ace25a44c..6d18071ea 100644
--- a/api/index.php
+++ b/api/index.php
@@ -71,7 +71,8 @@ function setupApplication($mode): Slim
             $facility_courier_countries, $facility_courier_countries_nde, $facility_courier_countries_link,
             $dhl_enable, $scale_grid, $scale_grid_end_date, $preset_proposal, $timezone,
             $valid_components, $enabled_container_types, $ifsummary, $synchweb_version, $redirects,
-            $shipping_service_app_url, $use_shipping_service_redirect, $use_shipping_service_redirect_incoming_shipments;
+            $shipping_service_app_url, $use_shipping_service_redirect, $use_shipping_service_redirect_incoming_shipments,
+            $dials_rest_url;
         $app->contentType('application/json');
         $options = $app->container['options'];
         $app->response()->body(json_encode(array(
@@ -95,6 +96,7 @@ function setupApplication($mode): Slim
             'synchweb_version' => $synchweb_version,
             'shipping_service_app_url' => $use_shipping_service_redirect || $use_shipping_service_redirect_incoming_shipments ? $shipping_service_app_url : null,
             'shipping_service_app_url_incoming' => $use_shipping_service_redirect_incoming_shipments ? $shipping_service_app_url : null,
+            'dials_rest_url' => $dials_rest_url,
             'redirects' => $redirects
         )));
     });
diff --git a/client/src/js/modules/dc/views/imageviewer.js b/client/src/js/modules/dc/views/imageviewer.js
index f28f488d1..cefd08ec9 100644
--- a/client/src/js/modules/dc/views/imageviewer.js
+++ b/client/src/js/modules/dc/views/imageviewer.js
@@ -79,10 +79,10 @@ define(['jquery', 'marionette',
             'slidechange @ui.zoom': 'slideChangeZoom',
             'keypress @ui.num': 'keyPressNum',
         
-            'click @ui.res': 'doThreshold',
-            'click @ui.ice': 'doThreshold',
+            'click @ui.res': 'doIceOrRes',
+            'click @ui.ice': 'doIceOrRes',
             'click @ui.invert': 'doInvert',
-            'click @ui.threshold': 'doThreshold',
+            'click @ui.threshold': 'reloadImage',
         
             'click button[name=next]': 'next',
             'click button[name=prev]': 'prev',
@@ -407,6 +407,11 @@ define(['jquery', 'marionette',
             this.ctx.setTransform(this.scalef,0,0,this.scalef,this.offsetx,this.offsety)
             var r = this.detectVerticalSquash(this.img)
             this.ctx.drawImage(this.img, 0, 0, this.width, this.height/r)
+
+            if (!app.options.get("dials_rest_url")) {
+                if (this.ui.res.is(':checked')) this._draw_res_rings()
+                if (this.ui.ice.is(':checked')) this._draw_ice_rings()
+            }
         },
                
                 
@@ -441,9 +446,9 @@ define(['jquery', 'marionette',
         // Apply image adjustments
         adjust: function() {
             if (this.brightness == 0 && this.contrast == 0 && !(this.invert_change || this.ui.invert.is(':checked'))) return
-          
+
             this.c.revert()
-            if (this.ui.invert.is(':checked')) {
+            if (this.invert_change) {
               this.c.invert()
               //_plot_profiles(lastx, lasty)
             }
@@ -469,7 +474,36 @@ define(['jquery', 'marionette',
             this.c.reloadCanvasData()
             this.c.resetOriginalPixelData()
         },
-    
+
+
+
+        // Draw ice rings
+        _draw_ice_rings: function() {
+            var rings = [3.897, 3.669,3.441,2.671,2.249,2.07,1.95,1.92,1.88,1.72]
+
+            this.ctx.strokeStyle='blue';
+            for (var i = 0; i < rings.length; i++) {
+              this.ctx.beginPath();
+              var rad = this._res_to_dist(rings[i])/this.ps*this.imscale
+              this.ctx.arc(this.model.get('XBEAM')/this.ps*this.imscale,this.model.get('YBEAM')/this.ps*this.imscale,rad,0,2*Math.PI);
+              this.ctx.stroke();
+            }
+        },
+
+        // Draw resolution rings
+        _draw_res_rings: function() {
+            this.ctx.strokeStyle = 'black';
+            this.ctx.font = this.imscale < 1 ? '10px Arial' : '30px Arial';
+
+            for (var i = 0; i < 5; i++) {
+              var rad = (((this.height-10)/2)/5)*(i+1)
+              this.ctx.beginPath();
+              this.ctx.arc(this.model.get('XBEAM')/this.ps*this.imscale,this.model.get('YBEAM')/this.ps*this.imscale,rad,0,2*Math.PI);
+              this.ctx.stroke();
+              this.ctx.fillText(this._dist_to_res(rad*this.ps/this.imscale).toFixed(2) + 'A',this.model.get('XBEAM')/this.ps*this.imscale-(this.low ? 10 : 40 ),this.model.get('YBEAM')/this.ps*this.imscale-rad+(this.low ? 10 : 40));
+            }
+        },
+
 
         // Plot spot profile
         _plot_profiles: function(xp, yp) {
@@ -760,7 +794,15 @@ define(['jquery', 'marionette',
             this._dra()
         },
 
-        doThreshold: function() {
+        doIceOrRes: function() {
+            if (app.options.get("dials_rest_url")) {
+                this.reloadImage()
+            } else {
+                this._dra()
+            }
+        },
+
+        reloadImage: function() {
             this.load(this.n)
         }