STEP BY STEP / Make the fellow yellow
1 Desaturate the leaves
Load TYLR60.dng into the Develop module. If you right-click a panel and tick Solo Mode, Lightroom will only display the currently active panel. Click to toggle open the HSL panel. Click the Saturation label. Drag the Red and Orange slider to -100 to desaturate the leaves.
2 Remove the blues
Drag the Green and Aqua sliders left to -100 too. This will desaturate the colours in the grass and convert these to greyscale. Instead of dragging sliders, click the circular Targeted Adjustment icon, then click the jeans to sample the colour and drag down to desaturate the blues.
3 Desaturate the skin
There’s a hint of skin tone remaining. Use the Targeted Adjustment tool to sample and desaturate the skin, or drag the Purple and Magenta sliders to -100. The only remaining colour is yellow. Boost the Yellow slider to +64 to make the raincoat look more vibrant.
4 Tidy things up
There are still some yellows in the background bushes. To remove yellow from these areas grab the Adjustment brush. Choose Saturation from the Effect drop-down menu. Drop the Saturation slider to -100. Clear Auto Mask. Set Flow and Density to 100.