To follow up further; I find the cleanest conversion is to put the JPG into the Word file. That means that it won't be converted down the line.
Through trial and error I have found the best size is 1400 pixels wide. I've converted all my images to landscape, so they are about 1400x1000 at this point.
I use Calibre to do DOCX to EPUB. Before doing, I set the output format to 'tablet'. This preserves the picture size in the EPUB file.
Then I edit the EPUB. I get into the stylesheet.css and I remove the lines that look like this:
.calibre12 {
display: block;
height: 359pt;
line-height: 1.2;
margin-left: auto;
width: 468pt
}
So they look like this:
.calibre12 {
}
Then I use Calibre to go EPUB to Mobi.
When I send to Kindle on Android, and also to Kindle Paperwhite, the images are on the top 40% of the page, full width. If I turn the unit sideways, the pictures stay the same size (so they must be being sized on the device).
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