What? You thought you graduated?
Please use this technique to recreate color that is specific.
I use my curve tool to its maximum limit.
Basically, if you have a car, you full speed max to the pedal. Non stop.
The first concept to understand when using curve tool is to use all adjustments.
There are 3 adjustments in curve tool.
Step 1 is to get out of normal.
don't be Normal!
know what you're choosing
Darken, Multiply, Color Burn... all those clustered are to darken pixels.
From Lighten to Lighter Color are lightening effects.
Overlay all the way to Hard Mix deals with contrast.
Rest is yours to explore.
Step 2 is the curve itself.
There are RGB, Red, Green and Blue channel.
changes are very delicate, because layer is no longer 'Normal'.
adjustment requires accuracy.
with combined 4 layers,
changes no longer seem to be small.
The key is to use all 3 colors to adjust.
While RGB channel seems perfect that controls all, it is easy for colors to add noise and/or reveal undesired color.
notice the green between red and blue.
it is bridging the two, and thus therefore adjustment was needed.
The R,G and B-channel controls will balance the effect of the curve even further, resulting in much controlled color in your photography.
Consider this minute control as a support to your daily curve tooling.
Step 3 is masking. You decide where it should go. ;))