jamesdolezal
commented
9 months ago Hi Meijian - the "MPP not found" errors are often symptoms of another underlying issue, such as corrupt/incomplete slides. For example, with MRXS files, a format in which the primary .mrxs file is accompanied by a similarly-named directory containing .dat files, a common issue is that some of the necessary .dat files are missing/corrupt causing the image to be unable to load. In some cases, these slide loading errors are reported as "MPP not found", even though the true error is a corrupt/incomplete file.
The first step in debugging these issues is to try opening the file manually in libvips and checking for errors:
import pyvips
from pprint import pprint
vips_img = pyvips.Image.new_from_file('/path/to/file.mrxs')
pprint(vips_img.get_fields())You should see a bunch of detected fields in that file.
If you get an error, then there is something wrong with the slide file. If that's the case, I would recommend either retransferring the file from wherever it came from (if feasible), and/or checking a file checksum/hash (if you have a comparison available).
If you don't get an error, then please share the output of the above code as it may provide some insights into what went wrong.
As an aside - I'm planning another documentation expansion over the next month or so, and I will include a section on slide debugging to help others who may encounter similar issues.
Meijian
Description
Hi James, I was running issues when extracting tiles from .mrxs slides using extract_tiles() function. About half of the images complained about "missing MPP (openslide.mpp-x)". It seems like some images don't have mpp-x in their properties. Is it possible to fix this bug by using something else? I used libvips as the backend.
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Expected behavior
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