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...

   def __init__ ( self ):
        # initialize data
        self.address =  "SxrEndstation-0|Princeton-0"
        self.data = None 

In each event, we add the image array returned from the getPrincetonValue function:

...

   def endjob( self, env ) :
        plt.imshow( self.data/self.countpass, origin='lower')
        plt.colorbar()
        plt.show()

        # save the full image to a png file 
        plt.imsave(fname="pyana_princ_image.png",arr=self.data, origin='lower')

Note that imsave saves the image only, pixel by pixel. If you want a view of the figure itself, lower resolution, you can save it from the interactive window you get from plt.show().
Image Added