@Hitch....
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"You're saying that simply using HDV-sized images, coded as KF8 (using %) and using the hidden/KF7 method will NOT work?"
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I'm not saying it will not work, but because of the larger sized HDV requirement for images then on a KF7 display your image will go to full screen width by default because of the rather large image sizes required for HDV. The HDV image sizing compliance is shown below:
- For 50% screen width, your image must be at least 600 x 900 px in size.
- For 75% screen width, your image must be at least 900 x 1350 px in size.
- For 100% screen width, your image must be at least 1200 x 1800 px in size.
The above HDV pixel sizings MUST be adhered to for all images on KFX devices or you will get image degradation. There's really no wiggle room here.
Let's take an example. Say you want to insert a banner-like image to be displayed at 75% screen width and you insert such an image that is in compliance with HDV for KFX for an image that is 75% of screen width. That means that your image used must be 900 x 1350 pixels in size for HDV compliance. The width value is the all-important value here. And if you see that image after running my AddKindleMediaQueries then it will look OK on KFX but, because that image is stored as 900 x 1350 pixels in the epub, the image display on your KF7 device will just default to full screen width which is not what you want -- you want 75% screen width.
But if you set all your images to real size in pixels to comply with KF7 image requirements, then after using my plugin you will get images that work on KF7 devices which are too small and which do not adhere to KFX's HDV image sizing compliance, so all such images will be degraded and look blurry and low quality on KFX devices as a result. I've also confirmed this through my own comparison testing. If you want to test this for yourself then you should use screen shot images with text; just stick those images into an epub(where all images are sized for KF7 devices) and run my media query plugin, which shows this problem on test particularly well either on a KFX device or in KP3. The text within those images will be blurry and unacceptable.
So for those images that have a width that is smaller than screen width -- how should you store those images in the epub? If you store them as real sized images(for KF7) or if you store them at a much greater pixel size for HDV compliance(for KFX) then, as I've shown, you are going to have problems either way. This also means that my media queries plugin may not work properly anymore for this new KFX format which p*sses me off more than just a little bit. I might even have to retire the plugin and remove it altogether from MR.
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"If you use the large image sizes dictated for KFX, but follow the CSS for KF8 and KF7, like in your plugin--what happens, exactly?"
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I think I've already answered your question above.