How to draw an ROI on an image and have the color to be transparent?

Hello,
I am using an ROI contour on a displayed image of my program and i want to programmatically change the color of it to transparrent.
I am using the property node and i bundle in the red green and blue values, however it does not accept the colorbox to change it to transparrent.
Do you know if there is any way to do this?
The result should be to draw an ROI and just have it invisible.
Thanks,
Christos

Hello Christina, thanks for your response.
These methods are
known to me, however, when you create a Display and then a property
node for the ROI contour color, the input of it takes only 8bit RGB
color. I couldn't find any node that takes the alpha, or the
transparent value.
Let me know if you have a more specific solution in mind to solve this problem.
Currently i believe that the Labview code for the ROI contour is insufficient.
Thank you,
Christos

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