histogramLUTitem not handling NaN values

[Peter Spuhler]

I have an image that contains NaNs (indicates invalid pixels). Imageitem appears to handle the NaN but histogramLUTitem does not.

My view is as follows.

self.img1 = pg.ImageItem(border='w')

self.lut1 = pg.HistogramLUTItem(self.img1)

self.view1.addItem(self.img1) 

histogram fails at

File "C:\Anaconda2\Lib\site-packages\pyqtgraph\graphicsItems\ImageItem.py", line 262, in setImage
  self.sigImageChanged.emit()
File "C:\Anaconda2\Lib\site-packages\pyqtgraph\graphicsItems\HistogramLUTItem.py", line 189, in imageChanged
  h = self.imageItem().getHistogram()
File "C:\Anaconda2\Lib\site-packages\pyqtgraph\graphicsItems\ImageItem.py", line 368, in getHistogram
  hist = np.histogram(stepData, **kwds)
File "C:\Anaconda2\Lib\site-packages\numpy\lib\function_base.py", line 507, in histogram
  'range parameter must be finite.')

besides fixing numpy histogram in function_base.py to handle NaNs it might make sense to change ImageItem.py line 368 from

        hist = np.histogram(stepData, **kwds)

to

        ind = np.isfinite(stepData)

        hist = np.histogram(stepData[ind], **kwds)