diff --git a/Viewer/package-lock.json b/Viewer/package-lock.json
index f1d6f740..9eee6362 100644
--- a/Viewer/package-lock.json
+++ b/Viewer/package-lock.json
@@ -32,6 +32,7 @@
         "requirejs": "*",
         "requirejs-plugins": "*",
         "sharp": "*",
+        "sharp-phash": "^2.0.0",
         "v8-compile-cache": "^2.2.0",
         "wildglob": "*"
       },
@@ -2853,6 +2854,17 @@
         "url": "https://opencollective.com/libvips"
       }
     },
+    "node_modules/sharp-phash": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/sharp-phash/-/sharp-phash-2.0.0.tgz",
+      "integrity": "sha512-MCcJCYew0RANBdIeT9dfEeJCYNjyl+bdJUeVuyTogbup01vZricvuAvWtzv6KjiF2WK9tnYvvqnucCMhrg8PEg==",
+      "engines": {
+        "node": ">= 10"
+      },
+      "peerDependencies": {
+        "sharp": ">= 0.25.4"
+      }
+    },
     "node_modules/sharp/node_modules/lru-cache": {
       "version": "6.0.0",
       "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-6.0.0.tgz",
@@ -5516,6 +5528,12 @@
         }
       }
     },
+    "sharp-phash": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/sharp-phash/-/sharp-phash-2.0.0.tgz",
+      "integrity": "sha512-MCcJCYew0RANBdIeT9dfEeJCYNjyl+bdJUeVuyTogbup01vZricvuAvWtzv6KjiF2WK9tnYvvqnucCMhrg8PEg==",
+      "requires": {}
+    },
     "shebang-command": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-2.0.0.tgz",
diff --git a/Viewer/package.json b/Viewer/package.json
index e1557345..aace6355 100644
--- a/Viewer/package.json
+++ b/Viewer/package.json
@@ -33,8 +33,8 @@
     "guarantee-events": "*",
     "ig-actions": "*",
     "ig-argv": "*",
-    "ig-features": "*",
     "ig-doc": "*",
+    "ig-features": "*",
     "ig-object": "*",
     "ig-types": "*",
     "json5": "^2.2.0",
@@ -42,6 +42,7 @@
     "requirejs": "*",
     "requirejs-plugins": "*",
     "sharp": "*",
+    "sharp-phash": "^2.0.0",
     "v8-compile-cache": "^2.2.0",
     "wildglob": "*"
   },
@@ -49,7 +50,8 @@
     "openseadragon": "^2.4.1",
     "flickrapi": "^0.3.28",
     "pouchdb": "^7.2.2",
-    "moment": "^2.29.1"
+    "moment": "^2.29.1",
+    "imghash": "^0.0.9"
   },
   "optionalDependencies": {
     "pica": "*"
@@ -60,8 +62,7 @@
     "less": "*",
     "rcedit": "^3.0.0"
   },
-  "-devDependencies": {
-  },
+  "-devDependencies": {},
   "bin": {
     "ig": "ig.js"
   },