The Invert effect inverts the colors in an image. When you invert an image, the brightness value of each pixel in the channels is converted to the inverse value on the 256-step color-values scale. For example, a pixel in a positive image with a value of 255 is changed to 0, and a pixel with a value of 5 to 250.

On the figures below you can see the video picture before and after applying the Invert effect:

Before applying the Invert effect

After applying the Invert effect