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<p>I can confirm that when we ran into this error, installing OpenJPEG 2.1.1 on our
<span>CentOS machines fixed the problem.</span></p>
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<p><span>~Michael</span></p>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> openslide-users <openslide-users-bounces+mgcurri=emory.edu@lists.andrew.cmu.edu> on behalf of Benjamin Gilbert <bgilbert@cs.cmu.edu><br>
<b>Sent:</b> Thursday, March 16, 2017 11:46:16 PM<br>
<b>To:</b> openslide-users@lists.andrew.cmu.edu<br>
<b>Subject:</b> Re: broken support for chroma-subsampled images</font>
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<div class="PlainText">On Thu, Mar 16, 2017 at 08:54:22PM +0000, Coudray, Nicolas wrote:<br>
> openslide.lowlevel.OpenSlideError: Cannot read this file because your OS<br>
> vendor ships a modified version of OpenJPEG with broken support for<br>
> chroma-subsampled images. OpenJPEG error: Error decoding tile. Component<br>
> 1 contains only 32768 blocks while component 0 has 65536 blocks<br>
> <br>
> We tried to download openslide from the 3.4.1 source and also via the<br>
> distribution packages. We tried to upgrade to openjpeg 2.1.1 as suggested<br>
> on some forums, but it hasn't solved the problem.<br>
> <br>
> Our system is<br>
> CentOS Linux release 7.3.1611 (Core)<br>
<br>
Hi Nicolas,<br>
<br>
The RHEL 7 bug report is marked ON_QA, so I'm assuming Red Hat will release<br>
a fixed OpenJPEG package soon.<br>
<br>
<a href="https://bugzilla.redhat.com/show_bug.cgi?id=1207473">https://bugzilla.redhat.com/show_bug.cgi?id=1207473</a><br>
<br>
Until then, the easiest fix is indeed to install OpenJPEG 2.1.x. After<br>
doing that, you will need to compile OpenSlide from source, and you should<br>
verify that the configure script finds your OpenJPEG 2.x installation. If<br>
you installed OpenJPEG to /usr/local, you will likely need to run<br>
"export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig" before running configure.<br>
<br>
--Benjamin Gilbert<br>
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