unreadable mirax file

[Benjamin Gilbert]

On 08/05/2013 04:43 AM, Priv.-Doz. Dr. M. Weihrauch wrote:
> John was so nice to post this file here. I have more images from the
> same scanner that seem to have the same problem, I uploaded one more
> image (appr. 300 MB) here:
>
> http://www.smartinmedia.com/stuff/A12.zip

Same problem, same value (1253).  Odd.

> I asked the lab, which scanner, which software version and what settings
> they use and will post this as soon as I have it

Thanks.

I've committed a fix:

     https://github.com/openslide/openslide/commit/54561528

--Benjamin Gilbert