Firstly, apologies for a vague title ; I didnt know what to say.
I have a particular pdf (book). However I am having a lot of trouble reading this pdf. The issue is that the background color, which is white, is "too much white or dark white" and the text of the pdf is "too much black or dark black" , which hurts the eyes a lot.
Now with other pdf files, what I normally do is
1) Configure the page color of ocular and set it to some light or medium gray shade which is comfortable
2) Control brightness using xbacklight to further improve reading comfort
However, none of these strategies work . Decreasing the brightness doesnt help because the colors ( as mentioned above) are still too dark. Changing page color for this particular pdf changes only border color of the page, and not of the entire page ; again no use.
So is there something which I can do ?
(Please keep in mind that I am a noob user who doesnt knows much of command lines etc and dont want unnecessary headaches just because I edited a wrong file..etc)
Thank you.
Best Answer
The problem is probably that this pdf is only a "pdf image file". With your cursor can you highlight words, i. e. the actual characters. Or does just draw a box.
Image pdf can have poor image contrast. Whereas if you use OCR (optical character recognition) then each character is distinct from the background, and Okular can set each independently; there by controlling your contrast ratio of light vs. dark.