Some sections of an eBook contain text stored as Bitmaps. I'm not sure why the publisher did this, as it looks horribly in Acrobat Reader:
Note that only code sections with the font "Teletype" have this problem. This looks like a mix of bad pixelation and wrong anti-aliasing. Zooming in and out doesn't help. I also can't seem to find a zoom setting in which this font actually starts looking good. I also have this problem with other PDFs containing bitmaps, but here it is starting to get really nasty.
In Foxit Reader, this looks a little bit better since the bitmaps get anti-aliased:
Is there a way to optimize the rendering in Acrobat Reader? It seems to have a few hundred settings but I couldn't find one solving my problem - interesting since this was(?) the number #1 PDF reader one day.
On a side note, the book says the code sections use the font "Teletype". It is not installed on my system and I don't know where I can find it (for free) - maybe installing this font will start rendering that sections as plain-text, and this bitmap-stuff is just used as a fallback method if the font is not found (then using small resolution bitmap replacements stored in the PDF)?
Also, I have already contacted the publisher if there is a version with correct true-text code sections.