Hi,
You need to use alpha masks in order for transparency to work in Vizard. The jpg image format does not support alpha masks. You need to convert the image to some other format, such as tif or png, and give the black areas an alpha value of 0.
Microsoft Office comes with a handy program call Microsoft Photo Editor. You can open your image with this program and use the "Set Transparent Color" tool to make the black areas transparent. Then you can save the image to tif or png format.
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