@jhowell...
Quote:
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"Do you have a reference for a different guideline that applies to High definition visuals (HDV) in Enhanced Typesetting?"
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I couldn't find the original link to the HDV definitions I used, but I did find the Amazon Kindle Publishing Guidelines, which has been updated for Enhanced Typsetting at
this link. Refer to
Image Guidelines - 9.4.2 Image Size and Quality Standards. There is a table that defines recommended percentage size to image size which is the one you want.
When I did an output comparison test between images(containing text) produced in a normal KPF file(images complied with HDV standard) versus an epub where the images were stored at their actual screen size in pixels(smaller images), the images and text in the KPF file were much sharper and less blurry than the smaller sized images used in the epub. You will also get the latter effect if you just use my AddKindleMediaQueries plugin in Sigil which was originally designed to dual format images for KF8 and mobi7 only(not KFX).