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A simple tutorial for newbies. Veterans don’t need to learn...
Let’s take a look at the effect first...
Original picture

renderings

1. Execute channel mixer, mode: color, transparency 70%


2. Hue saturation, linear deepening mode, 80% mask as shown in the figure


3. Merge, smoothing, curve darkening

Finish
If you go to LAB now, run Apply Image, Channel A, Mode Linear Light, Transparency.70%--100%
This is the effect

