diff --git a/girder_annotation/docs/annotations.rst b/girder_annotation/docs/annotations.rst
index d40448486..3376af761 100644
--- a/girder_annotation/docs/annotations.rst
+++ b/girder_annotation/docs/annotations.rst
@@ -387,11 +387,10 @@ Component Values
 Colors
 ~~~~~~
 
-Colors are specified using a css-like string. Specifically, values of
-the form ``#RRGGBB`` and ``#RGB`` are allowed where ``R``, ``G``, and
-``B`` are case-insensitive hexadecimal digits. Additionally, values of
-the form ``rgb(123, 123, 123)`` and ``rgba(123, 123, 123, 0.123)`` are
-allowed, where the colors are specified on a [0-255] integer scale, and
+Colors are specified using a css-like string. Specifically, values of the form ``#RRGGBB``, ``#RGB``, ``#RRGGBBAA``, and ``#RGBA`` are allowed where ``R``,
+``G``, ``B``, and ``A`` are case-insensitive hexadecimal digits. Additionally,
+values of the form ``rgb(123, 123, 123)`` and ``rgba(123, 123, 123, 0.123)``
+are allowed, where the colors are specified on a [0-255] integer scale, and
 the opacity is specified as a [0-1] floating-point number.
 
 Coordinates
diff --git a/girder_annotation/girder_large_image_annotation/models/annotation.py b/girder_annotation/girder_large_image_annotation/models/annotation.py
index b3e286a3e..07aa7725e 100644
--- a/girder_annotation/girder_large_image_annotation/models/annotation.py
+++ b/girder_annotation/girder_large_image_annotation/models/annotation.py
@@ -85,14 +85,17 @@ class AnnotationSchema:
     colorSchema = {
         'type': 'string',
         # We accept colors of the form
-        #   #aabbcc                 six digit RRGGBB hex
-        #   #abc                    three digit RGB hex
+        #   #rrggbb                 six digit RRGGBB hex
+        #   #rgb                    three digit RGB hex
+        #   #rrggbbaa               eight digit RRGGBBAA hex
+        #   #rgba                   four digit RGBA hex
         #   rgb(255, 255, 255)      rgb decimal triplet
         #   rgba(255, 255, 255, 1)  rgba quad with RGB in the range [0-255] and
         #                           alpha [0-1]
         # TODO: make rgb and rgba spec validate that rgb is [0-255] and a is
         # [0-1], rather than just checking if they are digits and such.
-        'pattern': r'^(#[0-9a-fA-F]{3,6}|rgb\(\d+,\s*\d+,\s*\d+\)|'
+        'pattern': r'^(#([0-9a-fA-F]{3,4}|[0-9a-fA-F]{6}|[0-9a-fA-F]{8})|'
+                   r'rgb\(\d+,\s*\d+,\s*\d+\)|'
                    r'rgba\(\d+,\s*\d+,\s*\d+,\s*(\d?\.|)\d+\))$',
     }
 
@@ -1009,7 +1012,7 @@ def _similarElementStructure(self, a, b, parentKey=None):  # noqa
                 if k == 'id':
                     if not isinstance(b[k], str) or not self.idRegex.match(b[k]):
                         return False
-                elif parentKey == 'user':
+                elif parentKey in {'user'} or k in {'fillColor', 'lineColor'}:
                     continue
                 elif parentKey != 'label' or k != 'value':
                     if not self._similarElementStructure(a[k], b[k], k):
diff --git a/girder_annotation/girder_large_image_annotation/web_client/views/imageViewerWidget/geojs.js b/girder_annotation/girder_large_image_annotation/web_client/views/imageViewerWidget/geojs.js
index bc84b551c..80317a5df 100644
--- a/girder_annotation/girder_large_image_annotation/web_client/views/imageViewerWidget/geojs.js
+++ b/girder_annotation/girder_large_image_annotation/web_client/views/imageViewerWidget/geojs.js
@@ -165,7 +165,7 @@ var GeojsImageViewerWidgetExtension = function (viewer) {
         _addPixelmapLayerParams(layerParams, pixelmapElement, levelDifference) {
             // For pixelmap overlays, there are additional parameters to set
             layerParams.keepLower = false;
-            if (typeof layerParams.url === 'function' || levelDifference) {
+            if (_.isFunction(layerParams.url) || levelDifference) {
                 layerParams.url = (x, y, z) => 'api/v1/item/' + pixelmapElement.girderId + `/tiles/zxy/${z - levelDifference}/${x}/${y}?encoding=PNG`;
             } else {
                 layerParams.url = layerParams.url + '?encoding=PNG';