deepzoom_server.py only shows black image

[yoderj]

Hi,

I'm trying to get started with deepzoom_server.py.   I downloaded:

deepzoom_server.py
templates/slide-multipane.html

The app now runs without errors, and I can see the main screen (in black)
as well as information about my multilevel .tif file through the browse.
But I can't see the image. The same image loads and displays a thumbnail
just fine with this code:

slide = openslide.OpenSlide(tif)
thumb = slide.get_thumbnail((10000,10000))
thumb.show()


I'm looking at the whole slide image (wsi) pds_12_HE.tif from the zip
peso_training_wsi_1.zip
<https://zenodo.org/record/1485967/files/peso_training_wsi_1.zip?download=1>
 at
https://zenodo.org/record/1485967#.XS42g-hKg2z
in case that is helpful.

Any idea what I should do differently?

Thanks,
Josiah
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