[Notjohn]

Instead of inserting the cover in Sigil, I would like to set it up in the underlying html file, so that I can cite it in the table of contents. My books go to Barnes & Noble, Apple, and Kobo in addition to the Kindle platform.

What's the best size of a cover? I have begun using 800 pixel width for images in my books, up from the old 600x800 convention (which itself replaced the earlier 450x550 pixel convention when the KIndle platform was launched in 2007). The advent of HD tablets seems to make that desirable, as well as specifying a relative width for the image.

Should I use 800x1000 for the cover, or 1000x1250, or what?

Again, my concern is to make the result look good on Nook, Apple IOS, and Kobo readers. I have no problem with the Kindles.

Thanks!