Base64 encoded image in ImageCell?

I'm trying to display a base 64 encoded image in my cell table. I've tried using the ImageCell but nothing is displayed.

Column<TravelDto, String> ownerImageColumn = new Column<TravelDto, String>(new ImageCell())
{
   @Override
   public String getValue(TravelDto object)
   {
      return object.getOwner().getPicture();
   }
};

Is this possible some other way?

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