Secondary Color Correction; Qualifying A Color - Blackmagicdesign Blackmagic URSA Installation And Operation Manual

Using DaVinci Resolve
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The curves palette is another tool you can use to make
primary color corrections, or enhance specific areas of
your clip when using a power window.
Use the HSL qualifier feature to select specific colors in your
image. This is handy when you want to make areas of your
image 'pop', to add contrast, or to help draw the audience's
attention to certain areas of your shot.
You can also use the curves palette to make primary color corrections. Simply click to create control
points on the diagonal line inside the curve graph, and drag them up or down to adjust the master
RGB contrast at different areas of image tonality. The optimum points to adjust are the bottom third,
mid, and top third of the curve line.
There are many more ways of doing primary color correction in DaVinci Resolve. Check the DaVinci
Resolve manual to learn how to use them all.

Secondary Color Correction

If you want to adjust a specific part of your image then you need to use secondary corrections. The
adjustments you have been doing up until now using the color wheels and lift, gamma and gain
adjustments affect the whole image at the same time and so they are called primary color corrections.
However if you need to adjust specific parts of your image, say for example you wanted to improve the
color in the grass in a scene, or you wanted to deepen the blue in a sky, then you can use secondary
corrections. Secondary color corrections are where you select a part of the image and then adjust
just that part. With nodes, you can stack multiple secondary corrections so you can keep working
parts of your image until everything is just right! You can even use windows and tracking to allow the
selections to follow movement in your images.

Qualifying a Color

Often you'll find a specific color in your clip can be enhanced, for example grass by the side of a
road, or the blue in a sky, or you may need to adjust color on a specific object to focus the audience's
attention on it. You can easily do this by using the HSL qualifier tool.
To qualify a color:
Step 1.
Add a new serial node.
Step 2. Open the 'qualifier' palette and make sure the 'color range' sample eyedropper tool
is selected.
Step 3. Click on the color in your clip you want to affect.
Usually you'll need to make some adjustments to soften the edges of your selection and limit
the region to only the desired color. Click on the 'highlight' button to see your selection.
Step 4. Adjust the 'width' control in the 'hue' window to broaden or narrow your selection.
Experiment with the high, low and softness controls to see how to refine your selection. Now you
can make corrections to your selected color using the trackballs or custom curves.