diff --git a/HISTORY.md b/HISTORY.md
index 7e88e9f1..9198652b 100755
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -73,6 +73,9 @@
     * German
     * French
 
+### 2019-04-30
+* Blocks, Threads: added "id" to image attributes dropdown
+
 ### 2019-04-29
 * optimized animation library
 * Threads: stop audio frequency instances when "stop all" is executed
diff --git a/snap.html b/snap.html
index 7d374f49..427e2adc 100755
--- a/snap.html
+++ b/snap.html
@@ -6,8 +6,8 @@
         <link rel="shortcut icon" href="src/favicon.ico">
         <script type="text/javascript" src="src/morphic.js?version=2019-02-07"></script>
         <script type="text/javascript" src="src/widgets.js?version=2019-04-05"></script>
-        <script type="text/javascript" src="src/blocks.js?version=2019-04-11"></script>
-        <script type="text/javascript" src="src/threads.js?version=2019-04-29"></script>
+        <script type="text/javascript" src="src/blocks.js?version=2019-04-30"></script>
+        <script type="text/javascript" src="src/threads.js?version=2019-04-30"></script>
         <script type="text/javascript" src="src/objects.js?version=2019-04-28"></script>
         <script type="text/javascript" src="src/gui.js?version=2019-04-27"></script>
         <script type="text/javascript" src="src/paint.js?version=2019-02-22"></script>
diff --git a/src/blocks.js b/src/blocks.js
index 3aff5a58..5dad5452 100644
--- a/src/blocks.js
+++ b/src/blocks.js
@@ -148,7 +148,7 @@ CustomCommandBlockMorph, SymbolMorph, ToggleButtonMorph, DialMorph*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.blocks = '2019-April-11';
+modules.blocks = '2019-April-30';
 
 var SyntaxElementMorph;
 var BlockMorph;
@@ -1015,6 +1015,7 @@ SyntaxElementMorph.prototype.labelPart = function (spec) {
                 null, // text
                 false, // numeric?
                 {
+                    'id' : ['id'],
                     'name' : ['name'],
                     'width' : ['width'],
                     'height' : ['height'],
diff --git a/src/threads.js b/src/threads.js
index d35c9012..2cc45a4e 100644
--- a/src/threads.js
+++ b/src/threads.js
@@ -62,7 +62,7 @@ StageMorph, SpriteMorph, StagePrompterMorph, Note, modules, isString, copy,
 isNil, WatcherMorph, List, ListWatcherMorph, alert, console, TableMorph, Color,
 TableFrameMorph, ColorSlotMorph, isSnapObject, Map, newCanvas, Symbol*/
 
-modules.threads = '2019-April-29';
+modules.threads = '2019-April-30';
 
 var ThreadManager;
 var Process;
@@ -4574,8 +4574,9 @@ Process.prototype.reportGetImageAttribute = function (choice, name) {
         return cst.height();
     case 'pixels':
         return cst.rasterized().pixels();
+    case 'id':
     default:
-        return 0;
+        return cst;
     }
 };