[ome-devel] Compression in OME-TIFF file?

[Curtis Rueden]

Hi Nick,
You can generate one using the Bio-Formats Exporter plugin for ImageJ.

First, open any image. Then choose Plugins > LOCI > Bio-Formats Exporter,
save as OME-TIFF format, and a dialog box will appear allowing you to select
the compression type—give either "LZW" or "JPEG2000" a try.

The compression will change nothing about the embedded OME-XML, only how the
TIFF planes are stored in the file. And all OME-TIFF compression is plane by
plane (i.e., no compression over a 3D block of pixels).

-Curtis

On Fri, Sep 4, 2009 at 4:16 AM, Nick Perry <nperry at stanford.edu> wrote:

> Hi,
>
> Does anyone know where I can download an example OME-TIFF file that is
> compressed? I see on the LOCI site (
> http://www.loci.wisc.edu/ome/ome-tiff-data.html) that it is possible to
> compress the data in an OME-TIFF file, like with LZW for example, and I'm
> trying to find out where in an OME-TIFF file the compression is specified.
> (This all hinges of course on my intuition that it is the raw image data
> that is compressed, and not the surrounding tiff structure/ome-xml block.)
>
> Thanks,
> Nick
>
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