|
I believe that some PDFs show scanned images, but contain the OCR'ed text in a hidden layer underneath. That makes the document searchable, while still showing the original text layout and non-text stuff like figures, icons,... I believe that ABBYY does that for you (maybe Elfwreck can tell you more about it).
If the document is missing the fonts and your system doesn't have them, then that would explain the grayed out text blocks if the hidden text is being partially displayed as well. I don't think you can add new fonts to the system that AdobeViewer will use (at least I haven't been able to do so for EPUB documents after a fair bit of trying). However, you could try adding the missing fonts to the /mnt/ext1/system/fonts directory and pdfviewer might use them.
|