It can be improved but it's not bad.
If you check the box in Prefences, Keyboard, Keyboard shortcuts, Accessibility, inverse color(?) Bildschirmfoto 2016-10-22 um 23.26.24.png 115.26KB 0 downloads
Then you can on a Mac with ctrl-alt-cmd-8 inverse the color from the screen.
IMG_1194.JPG 123.07KB 0 downloads I don't know why it is upside down.
Edited by Fabian, 22 October 2016 - 04:54 PM.