I attach two sets of photos, respectively for Sony portrait and landscape mode. The left hand side photos in each set are original pdfs. The right hand side photos are pdfs processed by pdflrf (Sony lrf format).
While originally pdflrf produced only lrf output, now it can process and output zipped png images, that can be converted (externally) to a pdf, improved as the screen visibility is concerned in relation to the original.
For another example see:
https://www.mobileread.com/forums/sho...958#post105958