I have two image heavy EPUB files.
A - 2,38 MB - Image resolution: 758x1024 (PW1/2)
B - 3,93 MB - Image resolution: 1072x1448 (PW3/Voyage)
There are only two differences between them:
- image resolution
- original-resolution meta property field
When I convert them using KindleGen V2.9 build 1029-0897292 with
-dont_append_source option size of output is strage...
A.mobi - 2,50 MB - This is OK.
B.mobi - 6,92 MB - Bloated like hell.
After further examination I discovered that HD_CONTAINER is added to B.mobi. For some reason it contain another copy of the same images, with the same resolution. Complete waste of space.
Headers:
A
B
It is not connected to input file size so I guess there is some boundary resolution that trigger creation of HD_CONTAINER. Additionally I experimented with original-resolution field but not found any connection with HD_CONTAINER creation.
Anybody researched this matter? Any idea how to strip HD_CONTAINER or modify EPUB so that container would not be created?