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Problem creating a custom background for an OpenCore 0.70 picker theme

Joined
Nov 18, 2015
Messages
161
Motherboard
Gigabyte Z390 Designare
CPU
i9-9900K
Graphics
RX 580
Hi All,
I would need to create a background image for an OpenCore 0.70 GUI custom theme. To do this I used an image in .png format with a resolution of 1920x1200 (the optimal resolution for my monitor) trying to convert it into a square image with a resolution of 1920x1920 (filling the canvas exceeding the 1920x1200 size with a transparent background) with .icns format: this however was not possible with the Preview App in macOS while using on-line converters I obtained images with the correct .icns format but with a maximum size of 512x512.
What am I doing wrong?
Thanks in advance for Your help
 
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