Make the colorscale default to the grayscale one
@@ -68,7 +68,7 @@ private boolean mosaicTiles = false;
private Bounds bounds = null;
private boolean useBounds = false;
private Set<Long> tileset = null;
-private ColorScale colorscale = null;
+private ColorScale colorscale = ColorScale.createDefaultGrayScale();
private boolean useTMS;
@Override
