I have downloaded Skim and everything was working fine until the last OS X update (El Capitán 10.11.1). Now I have the same problem with the freehand tool and as soon as I lift the pen everything I draw it disappears. I can confirm this is not a problem with Skim but with the Operating System because other tools that I have downloaded to draw over PDF have the same problem.
Paulo Colomés
NIS.CL
Post by Christiaan HofmanBy dark mode I mean something that makes the background dark and the text bright. Thanks.
No. You should realize that SKim just displays the PDF, and what that looks like is determined by that data.
What you could do, though, is to invert the colors via the option given in System Preferences → Access Aids (or similar name in English). However, this would have an effect on the whole display, not just a single application.
Best,
Claus
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