Quote:
Originally Posted by slowsmile
I made the point in my longer post above that images must be formatted for KF7 in absolute pixels whereas images formatted in KFX must be formatted as percentage of screen width AND must also comply with KFX's HDV image sizings. Dual formatting your images using media queries will certainly cover formatting for KF8 and KF7 devices but it does not properly cover KFX devices because HDV compliance also requires that you must use much larger images for KFX than the images required for KF8 or KF7.
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The Kindle Publishing Guidelines in section 9.4.2, Image Size and Quality Standards, call for a minimum of 300 ppi in a full screen (4"x6") image. They do not mention that applying to any particular format.
Do you have a reference for a different guideline that applies to High definition visuals (HDV) in Enhanced Typesetting?
Quote:
Originally Posted by slowsmile
AAnd if I format and add all my banner-like images to my epub according to the KFX HDV spec as 75% screen width then all I'm ever going to get on KF7 devices is a full screen width image which is not what I want.
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The images in MOBI7 books will tend to occupy a larger portion of the screen compared with how they display on newer devices. In my opinion if it looks the way you want in KF8 and KFX and is still readable in MOBI7 that is good enough.
This is outside of my area of expertise, but my understanding is that you can improve the handling of image sizes in MOBI7 by using media queries to display/hide different <img> elements tailored to each format. Use a style with percent height or width for newer devices and height and width attributes sized in pixels scaled down from the actual image dimensions for older devices. I assume that as an alternative you could use a separate reduced size image for MOBI7 without the need to specify its height/width since it defaults to the actual image dimensions. Hopefully someone will clarify this if I have it wrong.
(Edit to add: The post by Hitch prior to this one covers the above topic better than my attempt.)
How necessary is any of this? In my examination of books produced by major publishers I have not seen any attempts to provide special image fallbacks for MOBI7. Perhaps someone could point out an example of this being done.