Quote:
Originally Posted by slowsmile
Does the HDV compliance requirement, which is part of ET, apply to both KFX and KF8?
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Amazon has not been clear about the connection between High Definition Visuals (HDV) and Enhanced Typesetting.
The
Amazon Kindle Publishing Guidelines in section 9.4.2 Image Size and Quality Standards states a minimum quality requirement of 300 PPI for "important images", but does not state that those guidelines are specific to Enhanced Typesetting or HDV. Even version 2012.4, which long predated Enhanced Typesetting, stated "To future-proof the content, save images in 300 dpi or 300 ppi resolution."
The
KDP Enhanced Typesetting help page says: "
High definition visuals (HDV) support: Images are an important part of the reading experience and help authors tell their stories and engage with readers. With high definition visual support, Amazon improves on unique eBook experiences such as image zooming, pinching, and panning, and takes advantage of newer display technologies and device capabilities." It does not actually state what constitutes HDV.
The only mention of HDV in Kindle Publishing Guidelines was added in update 2018.2 and just repeats the quote from the help page.
There is a message built into the Kindle Previewer that states: "High Definition Visual Warnings (HDV) - These warnings are for images which does not meet high definition image bar of 300 PPI. We highly recommend fixing these issues to improve the quality of the book for the readers". According to that, 300 PPI is needed for HDV, but it does not tie that requirement specifically to Enhanced Typesetting.
In my research into KFX format, which implements Enhanced Typesetting, I have come across a different technical meaning of HDV. It seems that images that exceed 1920 pixels on a side are allowed in reflowable books in KFX, but not KF8, and books with those images are tagged internally as having yj_hdv 1.0.