Blur podcast art before downsizing it to various sizes
Podcast episode art containing high frequency information is subject to aliasing, which causes splotchy patterns in the thumbnails displayed in the episode lists and next to the progress bar at the bottom of the screen. (E.g. the crosshatch pattern on "The Weeds" by Vox)
I suggest you blur the images with a rect or gaussian filter before downsampling to reduce aliasing.
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