Update 1:
I can only make screenshots with the print button in window mode. Full screen mode does not work for me. Now I try again under the GOG program (Galaxy?) With F12 in full-screen mode.
Update 2:
Under the settings in TpF there is also no option for Screenshot to create, F12 is not occupied. If you start TpF via GOG-Galaxy, you can also create screenshots, which are stored under documents - GOG-Galaxy.
Update 3:
Unfortunately,
only the screenshots about GOG Galaxy with F12 scrap
(2017-05-17_0914_2.png), since everything is covered with a white veil /
fog / snow, Xanos. I have however no winter mod installed / activated. In the thumbnail white, clicked dark. Also on the PC and the image processing program the screenshots are white.
Update 4:
In window mode, the colors remain original (TpF in window mode.jpg). In the full image of GOG Galaxy the screenshots are definitely broken.
Update 5:
If you convert the broken PNG to JPG, the colors are repaired (TpF via Galaxy window and in JPG.jpg).