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Is there an easy way to display a PNG image (with transparency) as its own “window”, without any OSX window features (title bar, buttons, shadows)?

Ideally, it could also disappear when the mouse is clicked anywhere, or when Esc is pressed…

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Yes, this is possible. See Apple's RoundTransparentWindow code example:

This sample demonstrates how to create windows with custom shapes, no title bar, and transparent content. It also shows how to change the shape of the window and recalculate the drop shadow around the window border.

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  • I was hoping for something simpler ;), like an application. It looks like I'd have to modify the sample quite a bit to accept a file as an argument. If nothing else comes up I'll give it a shot...
    – user3231
    Commented Jan 21, 2016 at 6:11
  • Hopefully someone will come along who knows of an application that does this already. Otherwise, at least you now know it is technically possible.
    – Graham Miln
    Commented Jan 21, 2016 at 6:37

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