When you create your album artwork the graphic that represents your podcast (also referred to as show art or ID3 image), make sure you use a high enough resolution so that it displays well on large screens.
I recommend making your show logo 600 x 600 pixels. This is a square image that will display well on HD screens as well as .mp3 players such as an iPod. Create a .jpg is still a relatively small size in (usually less than 1mb) and will be compatible across all devices.
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