Thank you for help Patrick, that worked.  I take your point about including 
pyqtgraph source code in my project, it looks like the way forward. Thanks 
again Steve

On Monday, February 17, 2020 at 3:19:11 PM UTC, Stephen Shillitoe wrote:
>
>
> I have built a PyQt5, Python 3.7 windows application that uses PyQtGraph 
> to view monochrome (greyscale) Magnetic Resonance DICOM images. As I move 
> the mouse pointer over the image, I would like to display the value of the 
> pixel under the pointer on the window. There is no obvious (to me) 
> functionality in PyQtGraph to do this. I would be very grateful for any 
> suggestions by more experienced developers of how to do this. Here is an 
> edited code segment showing how I display the image (pixelArray) in an MDI 
> subwindow.
>
> layout = QVBoxLayout()
> widget = QWidget()
> widget.setLayout(layout)
> self.subWindow.setWidget(widget) 
>
> imageViewer = pg.GraphicsLayoutWidget()
> viewBox = imageViewer.addViewBox()
> image= pg.ImageItem(border='w')
> viewBox.addItem(image)
> imageView = pg.ImageView(view=viewBox, imageItem=image)
> layout.addWidget(imageView)
> imageView.setImage(pixelArray)
>
>

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