Olympus VSI format

Mathieu Malaterre mathieu.malaterre at gmail.com
Mon May 11 09:28:03 EDT 2015

Hi there,

On Mon, May 11, 2015 at 12:50 PM, Benjamin Gilbert <bgilbert at cs.cmu.edu> wrote:
> On 05/11/2015 06:07 AM, Priv.-Doz. Dr. M. Weihrauch wrote:
>> Benjamin: As far as I understood, there is not possibility to integrate
>> VSI into Openslide because of proprietary format, right?
> Hi Martin,
> I expect that we will support VSI at some point:
>      https://github.com/openslide/openslide/issues/143

Here is my simple `unarchive`code, it extract JPEG tiles from level=0.
The C code contains comment on how to compile and use. Otherwise:

$ cat CMakeLists.txt
project(ETS C)
add_executable(dumpets dumpets.c)
$ cmake .
$ make

To clarify what I said earlier VSI+ETS does not use the famous
0xffffffffffffffffL trick to store empty tile. Re-reading my code, it
seems that was when dealing with WTP+ETS Olympus WSI image, sorry for
the confusion. I do not have code to read the VSI TIFF structure, so I
have no clue what is stored in the private tags.

The code should be somewhat clear for reading, if not, feel free to ping me.

Caveats: it has not been agressively tested...

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