Since there is no "set saturation effect ..." block, this routine simulates it using ghost effect (and only 1 costume). The square on the left is the stamped costume. The square on the right is drawn with pen (which has a "set saturation effect...") to compare the accuracy of the effect. See inside.
The stamped costume was created with: Color - 0 Saturation - 100 Brightness - 100 1st, we stamp a gray-scale background, based on Brightness. Then, we stamp the Color, based on Saturation and Brightness.
