See
Reversing Everything:
Quote:
Picture viewer
I'm not sure why Amazon didn't make it public (maybe because paging is kinda slow), but there is a basic picture viewer in Kindle.
To activate it:
1) make a folder called "pictures" in the root of Kindle drive or SD card. Kindle also checks for "dcim" made by cameras.
2) put your pictures for a single "book" into a folder inside that. The subfolder name will be used as the "book" name. Supported formats are jpg, png, gif.
3) in Home screen press Alt-Z. A new "book" should appear. Open it to view your pictures.
4) In the local menu you can toggle dithering, resize to fit and full screen mode.
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The vast majority of Kindle "secrets" come from this blog.
I'm not sure what you get back if you send a zip of your JPEGs to Amazon for conversion. I generally make a HTML wrapper for the images and then convert to MOBI using mobigen.exe (or you can use MobiPocket Reader/Creator, or presumably send to Amazon for conversion). Note that the largest displayable image size inside a MOBI is 525x640 and images smaller than this will be up to doubled in size, see
Kindle Automatically Doubles Image Sizes.