[ome-users] loading images from matlab rounds doubles to integers

[Alexander Tournier]

Hi Will,

yes, you're right, when I get it through the API it does come out correctly.

I'm using integers for now as they'll be rendered correctly in the viewer.

Thanks,
Alex



On 28/07/11 11:18, Will Moore wrote:
> Hi Alex,
>
>    The OMERO rendering engine does not support floating point (32 bit)
> data.
> We have a ticket for that: http://trac.openmicroscopy.org.uk/ome/ticket/1303
>
> However, this is merely a rendered "view" of the data. It shouldn't
> mean that OMERO has rounded off the stored pixel values.
> How are you downloading the image?
> Whatever method it is, probably doesn't support 32 bit data either.
> Let us know if you need 32 bit support for whatever method you're
> using (or are you only doing it to 'check' the data)?
>
> If you access the pixel values through the API, you should see that
> they've been stored correctly.
>
> If the viewing of the data in Insight is the most important for you,
> and you don't care too much about the absolute pixel values,
> one possible work-around is to simply multiply the pixel values a bit,
> so that the overall range is larger.
> Then you won't notice the rounding of the data by the rendering engine.
> This is only a temporary idea - until we support 32 bit data in the
> rendering engine.
>
>
>      Will.
>
> On 28 Jul 2011, at 10:29, Alexander Tournier wrote:
>
>> Hi All,
>>
>> I'm loading images back to OMERO from matlab as doubles,
>> however OMERO seems to round the values to integer upon upload.
>> I've written a short matlab script to show the problem, see attached.
>>
>> when you run it an image appears in OMERO.insight, however it's
>> quite obvious that the pixel info has been rounded off, although it
>> is marked as doubles.
>> This is confirmed when one downloads the image.
>>
>> Any ideas?
>> Best,
>> Alex
>>
>>
>>
>>
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> William Moore
> Wellcome Trust Centre for Gene Regulation&  Expression
> College of Life Sciences
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