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If you want text and are okay with using something other than Preview, then the free version of PDF Expert described here is a good solution. The above do not preserve text, but produce images. Converting the resulting images into a PDF is done with a very simple Automator action, shown below: The first ffmpeg command inverts the colors of the screen recording and the second ffmpeg command places images from the screen recording into a sub folder at the rate of 2 per second. jpg's in the sub folder, right click and choose the Automator action shown below to make a new PDF Use QuickTime to make a screen recording (m.mov) of the white background pdf while clicking from page to page at, say 2 pages every second.Here's a workaround for a large number of pages, but it involves using ffmpeg and Automator repeat for each page then File>Export>PDF.In the Adjust Color Tool, switch the outer handles as shown in the animated.Check Replace Document Colours, and set the right colours you want. Once you install the 400MB app, you can change the background colour in Preferences( cmd+ ,) > Accessibility. Here is a work around for those who want to use Preview: So Preview does not have this feature, but more on that in a moment. Here's an example in "dark mode" (Hex color = #002B37, opacity = 75%). It's advisable to minimize the size (height) of the reading bar and tuck it somewhere out of the way.
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One word of caution: Inverting the reading bar makes the whole document your desired color and the reading bar an awful glaring white. Fast to change the color from a "dark mode" to a "light mode" and back.Easy to toggle on/off using cmd + shift + b.If you never use the reading bar for its intended purpose, this workaround won't interfere with your usual use of the app. Here's an example that gives Skim a solarized feel (Hex color = #B68A00, opacity = 50%). At 100% the document is completely hidden at 30% the trick has little effect. Select the desired color and opacity (50-80% depending on the color)Īll this does is add a layer of color over the top of the pdf.A simple workaround to change the background color in Skim is to (ab)use the reading bar preferences: