Thanks for bearing with me.
Although the "Replace" option was missing when editing the AZW3 file, I was able to replace the image when editing the epub. Then I converted the epub to the AZW3 file, and saw in Calibre that the transparency was working.
I converted it back to an epub and uploaded that to my Kindle app using SendToKindle. Unfortunately, the app showed that image with opaque white where there should have been transparency.
That fits with what Turtle91 quoted from the Kindle Guidelines.
Quote:
Originally Posted by JSWolf
You wouldn't send to Kindle. You would have to side-load via USB in order to do the testing. And if it works, you still cannot send-to-Kindle.
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Ah, too bad. Yeah, I'm using a Kindle app, not an actual Kindle. I thought Send to Kindle was side-loading because it's not downloading through the store.
As it happens, I'm testing this to give out to a couple hundred people, and they're not all going to side-load via USB to get the book. So, that's not really an option.
Thanks for the idea, anyway.
Quote:
Originally Posted by Turtle91
Making different colored backgrounds would be possible if there was a media querie that provided the background color.
However, I think that may be over thinking things a bit…
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I don't mind overthinking a little, particularly when I'm learning.
I read in another thread that some eReaders don't support media queries. They treat every MQ as matching, so all the code in each MQ would be applied. In this case, every variant of the image would be displayed.
Maybe javascript would work in place of media queries?