I'm making a custom *.saver application, and I would like to add my own thumbnail to show up above the name of screensaver (the ladybug pictures in the left column). How do I do that?
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By examining the default screensavers, I figured out that you need to add two files:
thumbnail.png, 58x90px
thumbnail@2x.png, 116x180px
When compiled by Xcode, this is automatically included in the .saver Resources folder as "thumbnail.tiff" with two subfiles.

Michael Wilson
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2Thank you for this! Small correction: the thumbnail images should be landscape, so 90x58 and 180x116. – zord Dec 30 '15 at 21:01
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Add two files where? In which directory? – Rob Erskine Jan 14 '16 at 15:54
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2Wasn't sure where to add this. Just want to confirm to anyone else looking to just add them to the root of the xcode project, and on build they'll show up as thumbnails. – Rob Erskine Jan 14 '16 at 16:01
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Whilst images of these sizes work, they no longer look correct as they have a strange outline. – Matt Sephton Mar 14 '19 at 13:33