Quote:
Originally Posted by isotherm
I think the screensaver image is cached. Also, it would be hard to extract the image from the mobi file if it has DRM. And it would need a different mechanism for Topaz books.
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Okay, the screensaver image is cached unfortunately, but the cache is refreshed every time the Kindle wakes up. So after the screensaver image is replaced the cached image is shown the first time the Kindle sleeps. But, after waking and sleeping again, the new image is shown.
Regarding DRM, the headers and metadata aren't encrypted as far as I know. Only the text and images. I haven't actually checked to see if the cover image is encrypted.
I guess this would only work for mobi files initially, but as light is shed on topaz, maybe it can be expanded to work for those files too.