[Image-SIG] Creating a Transparent Image and Placing it Over Another Image

Christopher Barker Chris.Barker at noaa.gov
Mon Apr 6 05:39:46 CEST 2009

Wayne Watson wrote:
>  I would like to create a transparent image with a circle 
> on it and a crosshair at the center of the circle, then place it on top 
> of the first (real) image (produced by the h/w). I have no trouble 
> drawing on the real image, but I'd like use this transparency idea here. 
> The reason is that eventually I'd like the user to drag around the 
> circle over the real image, 

I'm not sure what GUI toolkit you're using, but it probably makes sense 
to use the toolkits drawing routines for this kind of thing.

I know it's pretty easy with wxPython -- look fro various articles in 
the Wiki by searching for "drawing". Also, under "images", I think 
you'll find info about interfacing between IL images and wx.Image.


Christopher Barker, Ph.D.

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Chris.Barker at noaa.gov

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