https://github.com/OCA/web/pull/115#discussion_r28577254

web_widget_digital_signature/static/src/js/digital_sign.js

@@ -39,26 +39,20 @@ openerp.web_widget_digital_signature = function(instance) {
             }
             var $img = $(QWeb.render("FieldBinaryImage-img", { widget: this, url: url }));
             this.$el.find('img').remove();
-            var sign_options = {}
+            var sign_options = {};
             if ('width' in self.node.attrs){
                 sign_options.width = self.node.attrs.width;
             }
             if ('height' in self.node.attrs){
                 sign_options.height = self.node.attrs.height;
             }
-            if(this.view.get("actual_mode") !== 'edit' && this.view.get("actual_mode") !== 'create'){
+            var actual_mode = this.view.get("actual_mode");
+            if(actual_mode !== 'edit' && actual_mode !== 'create'){
                 this.$el.prepend($img);
-            }else if(this.view.get("actual_mode") == 'edit' ){
-                this.$el.find('> img').remove();
-                this.$el.find('> canvas').remove();
-                if(! this.get('value')){
-                    this.$el.find('> img').remove();
-                    $(this.$el[0]).find(".signature").signature(sign_options);
-                }else if(this.get('value')){
-                    this.$el.prepend($img);
+            }else if(actual_mode == 'edit' || actual_mode == 'create'){
+                if( actual_mode == 'create'){
+                    images = {};
                 }
-            }else if( this.view.get("actual_mode") == 'create'){
-                images = {}
                 this.$el.find('> img').remove();
                 this.$el.find('> canvas').remove();
                 if(! this.get('value')){