@Kolenka,
I checked another document: from the Adobe example
library
Download the "Alice in Wonderland" ebook, this has pictures in it. When you change the font size in ADE (on a PC), the pictures also scale with the fontsize.
On the other hand. I downloaded a free ebook from mobileread (Reprinted Pieces by Charles Dickens, Illustrated) in epub format. Opened it with ADE on my PC. Here the pictures do not scale with the fontsize.... I wonder why? Is there some additional formatting in this ebook, that is not there in the Alice in Wonderland ebook?