Thread: [GUI Plugin] Kobo Utilities
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Old 02-03-2021, 08:37 PM   #2132
davidfor
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Join Date: Jul 2011
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Quote:
Originally Posted by jackie_w View Post
I don't think JPG supports transparency, does it, or is that something from yesteryear? Wouldn't you need a PNG instead?
Good point. Looking at the code in calibre, it checks if the image has an alpha channel. If it does, it creates a canvas of the supplied colour (default is #FFFFFFF) and overlays the image on that.
Quote:
Anyway, I tried using a PNG with transparent background as a random screensaver in the .kobo/screensaver directory. It works OK. The background just looks the same as if it was white.
That's a good test. I'm sure the random screensaver is handled in the same way as the cover images. The only difference is if the cover generation is handling any transparency. I am pretty sure the epub cover generation would as it is renders the first page of the book. The kepub might not.
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