Alternative to Preview app to search for text in multiple documents at the same time

This seems to be a bug in Preview. There's a related thread about this topic in which many people say they are experiencing the same problem. I too have just tested it out and see the same results.

There are 2 workarounds I can think of. The 1st is to select all the annotations and set their color manually:

1. Open the annotations toolbar.
2. Press the right-most button which will show you a list of all the annotations.
3. Select all the annotations.
4. Choose a new color from the annotations toolbar.

The 2nd workaround is to use the Python script from the same thread previously mentioned.

So Preview does not have this feature, but more on that in a moment.

f.lux

I would strongly recommend you take a look at f.lux.

f.lux makes your computer screen look like the room you're in, all the time. When the sun sets, it makes your computer look like your indoor lights. In the morning, it makes things look like sunlight again.

f.lux will adjust (you can modify the strength) the colour of the whole screen to make it easier on your eyes. You can set it to be on all the time, or automatically come on at night time. People love it.

Now, back to your question...

Adobe Reader for Mac does support this. Once you install the 400MB app, you can change the background colour in Preferences (⌘ cmd + ,) > * Accessibility** . Check Replace Document Colours, and set the right colours you want.