[ome-users] ROI Colours: unexpected behavious with null alpha channel

[Paul Kibet Korir]

On 21/01/2016 11:10, Mark Carroll wrote:
> On 01/20/2016 05:09 PM, Paul Kibet Korir wrote:
>
>> If I set the fill colour of an ROI to rint(0) I get solid black instead
>> of nothing (100% transparent black).
>
> That's a surprise to me. I can however confirm it for the latest
> versions of both Insight and Web.
>
>> This appears the same as -16777216,
>> which I believe is black with full alpha channel (100% opaque or RGBA =
>> #000000ff).
>
> That makes sense to me.
>
> (snip)
>> Is this correct? Please correct me if I'm wrong.
>
> I have filed a ticket to have us look into this:
> http://trac.openmicroscopy.org/ome/ticket/13146. It certainly doesn't
> agree with the OME-XML schema documentation I pointed you to previously.
>
> In the meantime, if I set the alpha channel to just 01 instead of 00, so
> very nearly transparent, then both Insight and Web behave as we'd
> expect. Perhaps that workaround may suffice for now?

Yes, I saw the same thing. It will work for now.

Thanks for your response.
>
> -- Mark
>
> The University of Dundee is a registered Scottish Charity, No: SC015096
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-- 
With kind regards,

*Paul K Korir, PhD*
/Scientific Programmer/
EMBL-EBI
Main Building, A2-35,
WTGC, Hinxton, Cambridge CB10 1SD
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