pg.exporters output files display data cramped into upper left corner

[Fizik Jadershik]

Here's minimal working example:

def spectrogram(data):

    import pyqtgraph as pg

    import pyqtgraph.exporters

    from pyqtgraph.Qt import QtCore, QtGui

    app = QtGui.QApplication([])

    plot = pg.ImageView(view=pg.PlotItem())

    plot.setImage(data)

    exporterp = pg.exporters.ImageExporter(plot.imageItem)

    exporterp.export('spectrogramp1.png')

    exporters = pg.exporters.SVGExporter(plot.imageItem)

    exporters.export('spectrograms1.svg')

    plot.close()

if __name__ == "__main__":

    import numpy as np

    test = np.random.randint(-32000, 32000, (2048, 2048))

    spectrogram(test)

What happens is that instead of filling the whole image, the data takes up only a fraction of space in the generated image. For instance, the code for PNG export above reliably produces http://i.imgur.com/8SiV0x0.png ( http://i.imgur.com/OjF99JD.png ) as the output.

I am not familiar with SVG all that well, but there seems to be a similar problem there too.http://i.imgur.com/AAeBx05.png ( http://i.imgur.com/3FZESJM.png ). Another thing that I can discern from here, regarding the SVGExporter, is that it seems to be neglecting view=pg.PlotItem() argument for pg.ImageView as I don't see axis there.

Any suggestions? I was able to generate "full size" PNGs initially, but I can't recall any major differences between this code and one of the earlier examples that I wrote.