Control line

The Control Line tool is a graduated filter that uses the Control Points technology (Upoints).
* This mask can be used to replace several control points. 

Two selectivity parameters define the sensitivity of the tool, according to the color (Chroma) or to the luminosity (Luma), on a reference area located by a selectivity selector (dropper).
* This dropper is only displayed for the active control line to avoid any confusion.

– Set to 100%, the tool is very selective by considering only close tones
– Setting a parameter to 0% applies the effect of the mask to the entire tonal range
e.g. 50% Chroma and 0% Luma to correct all areas of the same color, light and dark
– The two sliders at 0% turn a control point into a radial filter

The Control Line and Control Point masks can be used together
* Masks complete the main area.
* Secondary masks protect some areas.
Illustration 1, the Control Point tool acts as an eraser on an internal area
Illustration 3, correcting a misunderstood external area

– With the first tool (line or Upoint) still active, select the other tool
– The corrections are the same for all masks
– The iterations of the two tools are independently active or “protective”
– The Alt key is used to create a protective mask

MacOS only:
In Local Adjustments mode on an cropped mage, it is now possible to display the full image for more convenience.
– Toggling on the “Show uncropped areas” option in the tool’s toolbar

The first use case consists in modifying the sky without changing the foreground.

1- No correction – The sky is too bright
2- Classic graduated filter – The character is also darkened
3- Control line with the dropper placed on the sky. 50% selectivity (default) – The character dressed in blue is darkened
4- Chroma selectivity at 100% – The character is almost ignored by the correction
5- Protection control point associated with the Control line – The character is not corrected

An alternative use of selectivity turns the Control Point tool into a standard radial filter.
The character needs to be lightened, the patchwork costume makes it difficult to apply the standard Control Point mask.

0- Place two control points (here voluntarily on dark areas) – Not much happens
1- Set both mask selectivity parameters to 0% allows the local lightening setting to be applied

A last example of an application to quickly correct an image with two different tones. 

0- No correction – Color temperature difference is too sharp
1- Control line with the pipette placed on a plate 
Note the two lines outside the frame, the dropper is enough to define the area
Luma at 75% to hold the correction in the light areas
The scene retains its atmosphere but the light areas are less yellowed
2- Protection control line – A denatured area of the wall is restored

This tutorial will be updated in December.
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