Enhanced Podcasts - opitmal photo sizes

The Nano, 4G and 5G iPods have a different screen sizes, so what's the best size for the pictures in an Enhanced Podcast?
Also, what format is best to avoid re-compression? -- Jpeg?
Thanks!

I started this post thinking the 4G and nano's ratios were the same, but now I've learned different! The 5G and nano resolutions have the same ratio, ie. a 320x240 picture scaled for the nano will still fill the screen. AND, I believe I ran tests earlier that showed that a picture at a 4:3 ratio will still fill an iPod color 4G screen with no black edges (I believe the left and right edges are chopped off.)
Anyway, the "perfect" solution would be to have three different sets of media (like this guy http://www.ipodsubwaymaps.com/) to prevent re-compression, but outside of that, if this is photos (not map info which has to be pixel perfect) create one 4:3 picture that will match either the nano's or 5G's native resolution. I'm not even certain if you should consider the 4G since, when I last checked, you couldn't get the artwork of an enhanced podcast to stay on the screen, so no one on those pods would see it anyway (unless Apple updates the firmware to handle this one day).
To answer your other question, I believe any image you offer is going to be recompressed by iTunes to show on the iPod, so start with a nice lossless format so the algorithm has a good source to sample from, like PNG.
Message was edited by: Kyn Drake

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