std.Invert(clip clip[, int[] planes=[0, 1, 2]])

Inverts the pixel values. Specifically, it subtracts the value of the input pixel from the format’s maximum allowed value.

Clip to process. It must have integer sample type and bit depth between 8 and 16, or float sample type and bit depth of 32. If there are any frames with other formats, an error will be returned.
Specifies which planes will be processed. Any unprocessed planes will be simply copied.