Arrived in SFO for DPA

Currier, Michael Gilman mgcurri at
Wed Oct 22 10:10:35 EDT 2014

I can probably generate some blank/smiley face CZI files next week if that will help.  I didn't realize they were in demand.
From: at [ at] on behalf of Benjamin Gilbert [bgilbert at]
Sent: Friday, October 17, 2014 6:38 PM
To: openslide-users at
Subject: Re: Arrived in SFO for DPA

On 10/17/2014 03:34 PM, PD Dr. M. Weihrauch wrote:
> Also, how does it work with file-formats anyway: If we find out
> ourselves, how a certain file format works, are we automatically allowed
> to implement that into OpenSlide or do the scanner-vendors have to agree
> that we read their formats?

If development is done properly, they don't need to agree.  (Standard
disclaimer: I am not a lawyer and this is not legal advice.)

Ideally, vendors would publicly document their formats (Aperio has done
this in the past), in which case we can use their documentation.  In
contrast, some vendors will provide documentation, but only under a
non-disclosure agreement, and those agreements often do not explicitly
state whether creating an open-source program to read the format is
"disclosing" the contents of the documentation.  In general, my own
choice is not to accept NDAs (and, thus, not to use the restricted
documentation), though that is not necessarily the only possible
approach.  Since this leaves me with very little usable documentation, I
end up spending a lot of time with file format samples, tiffdump, and a
hex editor.  (One reason why file format samples are so important!)

> I would be especially interested in being able to read
> - Olympus images (.vsi + .ets)

We do have Olympus samples in openslide-testdata, but I haven't spent a
lot of time examining them.  If anyone else wants to do so, insights
would be welcome.

> - Zeiss images

We have some ZVI images, but no CZI images, and I gather that CZI is
more important for OpenSlide's use cases.  If you can provide some
samples, let me know.

--Benjamin Gilbert

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