MRC signed byte

[hroque]

Hi all,

I've been uploading EM files to OMERO and realised that OMERO does not appear to properly scale images for displaying when the file is signed byte. So everything that is below 0 gets truncated and its impossible to visualise the image properly in omero. Not sure if this is a bio-formats bug or just a display issue in OMERO so ended up posting here.

Uploaded file: image.mrc~
Cheers,
Helio

[jmoore]

Hi Helio,

could you also tell us what version you are currently using?

Cheers,
~Josh

[hroque]

Hi Josh,
Sorry forgot about that info. Am using 5.0.8.
Helio

[sbesson]

Hi Helio,

thanks for uploading your sample image. Afer verification, at the moment, the MRC reader does not support the mode 0 with signed bytes and forces unsigned bytes for this mode. So the truncation is happening directly at the Bio-Formats level.

I opened a Pull Request to add support for signed bytes following the MRC specification. I would expect this PR to be included as part of the 5.1.0 release.

Best,
Sebastien