sorry i don't speak german, but i understand.  Commix  nice to help others. But what I also see, the white balans is not correct. First, you have to make you white balans, than what you doing , like constrast and so on.  Also, when you make a video-shoot. Try to get as much light as posible. light is life for video. When the origenal is not bright, its not good.  I know, its not always posible to have alot of light. But some  Electr.. light or even a mirror can help alot.  But its super, you are making time for others to help them make better movies of films. .
Friendly Greetings from Belgium, Peter