The conversion don't import the images ! Why ?
 

The Caliber convector is powerful, but I find it has a big flaw :

He doesn't import the images!

By "imported" I mean: extract from the source file and then integrate them into the final ePub without modification.
But that's the problem, before integrating the images, he modifies them: he reduces their size and compresses them too much (artifacts appearance).
The problem does not come from the extraction because when you create a ZIP version, the images are extracted correctly.
If this default behavior could be disabled, I wouldn't say anything, but it's not possible (a highlight of Caliber is its customizing)
All this forces me to have to manually replace the images in the ePub, task tedious and very unpleasant.
If this behaviour is not removed, an option for disabled this almost mandatory.

Try setting the output profile to tablet.

Sent from my Nexus 7 using Tapatalk

Thank you very much.
However, I would like to say that I do not find this very intuitive.
A better system would provide the possibility to define the screen dimensions yourself, with an explicit chek for enable/disable the option ("Output profiles" are only templates)

For a lot of calibre user is this usage quite normal as most E-Reader devices in the past (and today also) had always a limitation for max resolution. Wrong picture sizes can be in best case a point of not opening an ebook, in worse case it crash the reader and only a hard reset will start the reader again.

This is why this is driven by device. In addition, if a device don't need to rescale pictures it will handle ebooks much faster.