The HSL Primaries Video Filter was added in Shotcut 25.01.03
The HSL Primaries Video Filter operates in the HSL color model. It can adjust the Hue, Saturation or Lightness of the 6 primary colors in the image. The hue can be shifted +/- 180 degrees. The saturation and lightness can be scaled by a configurable factor.
The Overlap parameter controls how much an adjustment can fade into the adjacent color channels. This can be helpful to avoid banding when the image has a gradient that fades from one color to another.
This example shows an image with a blue car and no adjustments to the filter:
If a shift is applied to the blue and cyan color channels, the car appears purple:
If, instead, the lightness is scaled down, the car appears a darker blue:
See also:
Hue/Lightness/Saturation Video Filter
HSL Range Video Filter