I recommend checking out section 9.4 (Image Guidelines) in the
Amazon Kindle Publishing Guidelines.
Some highlights:
Quote:
Use a resolution of at least 300 ppi for all images.
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The maximum size of a mobi is 650 MB. KindleGen performs automatic image conversions to optimize the content for Kindle. You can obtain the best results by optimizing your images to the highest quality possible within the file size limit before inputting your files into KindleGen.
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Photographs should use the JPEG format and be saved at high quality. (In Adobe Photoshop, choose Save As, select JPEG, and click Save. In the following JPEG Options dialog box, choose a Quality level of 10 or higher.) Photographs should use the highest resolution available within the file size limit.
Photographs of less than 300 x 400 pixels create a poor customer experience on high-resolution devices.
Amazon recommends that images display clearly at 2X magnification across devices. This means that if an image is intended to display at full width on device, its width should be captured at 3200 px (this is twice the width of our highest resolution device, the Kindle Fire HDX 8.9”). Smaller images can be resized
accordingly.
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Of course these are only guidelines.