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

[Paul Kibet Korir]

Hi,

If I set the fill colour of an ROI to rint(0) I get solid black instead 
of nothing (100% transparent black). This appears the same as -16777216, 
which I believe is black with full alpha channel (100% opaque or RGBA = 
#000000ff).

I get the same results with other colours that set the alpha channel 
(the first byte of the 32-bits) to 0.

Is this correct? Please correct me if I'm wrong.

-- 
With kind regards,

*Paul K Korir, PhD*
/Scientific Programmer/
EMBL-EBI
Main Building, A2-35,
WTGC, Hinxton, Cambridge CB10 1SD
P: +44 1223 49 44 22
F: +44 1223 49 44 68
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openmicroscopy.org.uk/pipermail/ome-users/attachments/20160120/466aea9f/attachment.html>