Quote:
Originally Posted by MiniMouse
You really tried them on your reader? With the cover of the epub in standby-mode? Fist the simple questions again 
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Yes, I did.
It is my understanding that the viewport (id est the space reserved for picture, something like screen size minus borders) defines the size in "normal" mode, while in "sleeping mode" the screen is used all, and the Sony tries to enlarge the photo to fit its screen, because the image is larger. It's a theory, not a fact.
My settings are simple: they use the presets for Sony devices in calibre, which defaults to my understanding to a screen resolution of 800x600. The image is automatically resized to something less, while keeping its DAR.
This also works for my T3, despite a better resolution.
Now, a last question.
Somewhere "hidden" on the READER partition there is a tree with thumbnails. These are the images used in the Sony's library. It is my understanding that Sony takes the covers from the ePubs and store them there for a quicker access (that's why you have to delete the books via Sony and not via calibre, sure is sure). In the same tree are also stored the annotations

if any.
See whether the cover has kept its DAR (it should if one
so instructs calibre).
You can also alter the values there by hand to a little less than 1024x758 (ie margins).