code: public PageSnapshot blurExcept(WebElement element) {
          try{
              image = ImageProcessor.blurExceptArea(image, new Coordinates(element,devicePixelRatio));
          }catch(RasterFormatException rfe){
              throw new ElementOutsideViewportException(ELEMENT_OUT_OF_VIEWPORT_EX_MESSAGE,rfe);
          }
          return this;
      }
docs: Blurs all the page except the element provided.
  
  @param element WebElement to stay not blurred
  @return instance of type PageSnapshot