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<p>I don't work with C interface, I just use the tools under Linux
and recently have problem with the Mirax files generated by the
new 3DHistech scanner. The new file format does contain some extra
information that OpenSlide rejects or doesn't understand. I read
in other mailing lists that people have successfully use 3DHistech
converter (free download from 3DHistech site) to convert from
MIRAX format to MIRAX format (same format conversion) and can
successfully use the converted file with OpenSlide. The converter
basically removes the extra overlapping information from the file,
This is an extra step that needs to be done on the scanner PC. Is
there possibility that OpenSlide library can be updated to avoid
this conversion step, eg, skipping the overlapping information in
the new Mirax format.</p>
<p>Regards,<br>
Thomas<br>
</p>
<div class="moz-cite-prefix">On 4/9/2020 11:21 PM, Terry Wilson
wrote:<br>
</div>
<blockquote type="cite" cite="mid:CAAkw33pA2EAd22he1T63aKhs7bdBX-tvPAZob4OPKu2Sha9Bvw@mail.gmail.com">
<div dir="ltr">I am using the C interface to the windows version
of OpenSlide. I have successfully used it to for a number of
different formats, however, the same code does not appear to be
working for Mirax slides. I am able to open the slide and see
the various properties, however, anytime I try calling
openslide_read_region, it always just fills in the buffer with
0's. According to the documentation that is an indication of
some error, however, calling openslide_get_error immediately
after just returns a null error object.
<div><br>
</div>
<div>I saw an older post from someone on this mailing list who
seemed to have the exact same problem I am having with Mirax
slides ... unfortunately they seemed to eventually get it
working but had no idea what they changed to get it to work.
So I am looking for some suggestions on what to try. I have
tried retrieving all the data for the entire level 0 using a
tile size of 512x512 and they all seem to come back with 0's.
I tried getting an entire higher level (level 6) with one call
but same result. I have also tried various different Mirax
slides (including some of the demo ones from the OpenSlide
site) The code is pretty simple:</div>
<div><br>
</div>
<div>// Try reading a single tile</div>
<div>// x, y values start at 0,0 and increase based on the tile
size</div>
<div>int size = 512;</div>
<div><br>
</div>
<div>uint32_t *data = new uint32_t[size * size];<br>
<br>
openslide_read_region(openslide, data, x, y, 0, size, size);<br>
const char* err = openslide_get_error(openslide);<br>
if (err != NULL)<br>
{<br>
printf("error detected");<br>
}<br>
<br>
</div>
<div>I used openslide_get_property_names /
openslide_get_property_value to dump out all the various
metadata values for the slides ... is there some value in this
metadata that I need to be accounting for (I assumed that the
OpenSlide library was already doing that)? Any suggestions on
how to trouble shoot this problem would be greatly
appreciated.</div>
<div><br>
</div>
<div>Regards,</div>
<div><br>
</div>
<div>Terry</div>
</div>
<br>
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</blockquote>
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