Creating Looks - The Art and Technique of Digital Color Correction - page 438

Fig. 10.68 Image after second secondary correction was added.
Fig. 10.69 Data from second secondary.
Pep continues tweaking the look of the shot by adding another sec-
ondary and qualifies the green grass using an HSL key and a vignette
( Figures 10.71 and 10.72 ), being careful to select the grass but not the
green of the pillars.