Workflow to reproduce flower image in LL saturation mask tutorial:

Read images like a comic strip:

Source    Transformation                    Result:  Comment:
(7)       Color/Extract Channel (HSL-L)        (1)
(1)       Invert image                         (2)
(2)       Grey/Brightness Curve Amt=100
             lighten: (0,0) (50,60) (100,100)) (3)
(1)       Color/Extract Channel (RGB-G)        (4)
(4)       Composite  Src=(4) at 100%
                     Ovl=(3) at 70%            (5)
(5)       Grey/Brightness Curve
               (increase contrast)             (6)    final mask
(7)       Color/Curves  Space=HSL
               Mask=(6)  AmtWhite=100, Black=0
               H: (0,0) (14,16) (100,100)
               S: (0,0) (50,44) (100,80)
               L: no change                    (8)    final edit
(9)                                            (9)    tutorial result


Second workflow:

Source    Transformation                    Result:  Comment:

flower    Make Mask:
          Contract/Shift-Trace Yellow petal area
          Blur radius=10                       (2)
flower    Color/Curves  Space=HSL
              Mask=(2) White=100,Black=0
              H: no change
              S: (0,0) (72,70) (100,90)
              L: no change                     (3)
 (3)      Color/Curves  Space=HSL Amt=100
              H: (0,0) (46,49) (70,70) (100,100)
              S: (0,0) (50,50) (90,85) (100,90)
              L: (0,0) (50,49) (100,100)       (4)   final edit