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Originally Posted by twynn92
do we know if the KF8 downloads on Kindle For PC started having low-resolution images the moment KFX went live, so as to not waste storage space?
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It is more a matter of higher resolution being supported on newer apps and devices over time. KF8 has a resolution limit for backward compatibility. That was later worked around by adding a separate AZW6 file for increased resolution of images. KFX is able to support the highest resolution. (AZW6 and KFX are both only delivered directly to devices that support them and are not available for download.)
Amazon delivers different packages of images tailored to different device types to save on bandwidth and storage. Amazon's current guideline for publishers is a width of 3200 pixels for a full page photo image in order to support viewing on high resolution tablets, but e-ink Kindles will actually receive much lower resolution images than that from Amazon.
Quote:
Originally Posted by twynn92
Are there any devices/configurations that still use KF8 as the default format?
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Older devices and apps. The third (2010) through fifth (2012) generation Kindles support KF8, but not KFX. Thankfully Amazon continues to support these with no sign of that ending.
KF8 is also the fallback format for books that are not available with Enhanced Typesetting, such as fixed-layout children's books.
Quote:
Originally Posted by twynn92
I assume that any configuration still using KF8 would be too small for high-resolution images to make any difference unless, of course, Kindles have some sort of magnification option for low-vision folks.
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Kindles have a pinch-zoom feature for images that allows more detail to be seen.