Fixed bug that did not load previous settings

src/matlab/ViewerControls.m

@@ -96,15 +96,15 @@ localStruct = struct(...
     'b',1.0,...
     'c',0.0);
 
+if isempty(channelData)
     channelData = localStruct;
-
     if (imageData.NumberOfChannels>0)
         for i=1:imageData.NumberOfChannels
             localStruct.color = colors(i,:);
             channelData(i) = localStruct;
         end
     end
-
+end
 
 if (imageData.NumberOfChannels>0)
     for i=1:imageData.NumberOfChannels