Is it possible to use PNG images as thumbnails in simple lightbox?

Q: I love your visual light box. It really works well. Can I ask, is it possible to have a transparent background so that it can be embedded into a different web page, or can I add a background image so that I can give it the same feel?

A: Try to do the following:

Gallery->Properties->Thumbnails
Select 'PNG' format from "Thumbnails format" list and generate your gallery.

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