Ok, I think I'm missing something. Bookbub says to make the ad art 300X250 pixels. But it doesn't say what size the image should be - i.e. what the DPI should be or what the final size should be in inches... Anyone know?
DPI and inches are irrelevant if they're giving pixel dimensions. If your image editing software is asking for that, you can just leave whatever the default is, or enter something arbitrary. All that matters is 300X250.
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