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It turns out that the two annotations ('draw'ing-type markups) are NOT in PNG format, but an (internal) undocumented PICT image format. See below .zip file for the actual PICT image files. Anyone recognize this image format and able to view them?
The two .png images I saw, listed in the imp_dump.pl text output, were the ones in the ebook I extracted, namely, the 'Animal Farm cover' picture as well a 'mobileread logo' picture of size 105x140 and 158x51 respectively.
Oh, well! Now I have to explore this new (old) PICT format to see if the annotations are an 'overlay' image (which I suspect) over the text. Extracting just those 'overlay' images may not be fruitful if no ebook text is there to reference it.
I think, in the long-run, the printing to a .pdf file is a better solution than extracting the image!
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