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As pdurrant says ignore ppi when determining the picture size. Use pixels to determine the size you want for the image. For most eBook readers anything over about 1024 pixels wide is overkill for the purpose of displaying images. Most eBook readers will not let you zoom an image so you are restricted to viewing it with the number of pixels on the screen. Figure out the target devices and set the image sizes appropriately. Setting a bit bigger will allow for future high resolution devices but I would worry more about the sizes of the image that a super high resolution that the reader will never notice.
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