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They have color correction sliders for yellow-blue and green-magenta but not for red-cyan, unlike in Photoshop. It is really annoying to go into Photoshop when I need to make those simple adjustments -- does anyone know a reason this isn't included in Lightroom?

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    \$\begingroup\$ Because it's set for the primary two camera-centric adjustments: temperature and tint. \$\endgroup\$
    – L. Scott Johnson
    Commented Jan 18, 2020 at 20:37
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    \$\begingroup\$ Don't close this: Kai's answer shows that there is a mathematically-correct answer to it. The OP may have the opinion that Adobe doesn't understand color, but that doesn't mean the correct answer is also opinion-based. \$\endgroup\$
    – Warren Young
    Commented Jan 19, 2020 at 16:11
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    \$\begingroup\$ You can get the same results as a cyan ←→ red slider by using both the blue ←→ yellow and green ←→ magenta sliders together. \$\endgroup\$
    – Michael C
    Commented Jan 19, 2020 at 20:45

1 Answer 1

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If you look at any color wheel, you have two axes on the wheel:

color wheel

To correct any color cast, this is usually enough. You can correct the main source of color shift in natural light on the temp axis (blue/yellow), and then do the fine tuning on the tint axis (magenta/green). Tint most often occurs through artificial light.

         magenta
  red      |
        x--|
        |  |
yellow ----+---- blue
           |
           |
           |     cyan
         green

The axis you propose is actually 45° off these axes, you could also correct any cast in this direction by using the other 2. However, this also explains why there is no 3rd slider: using it would always affect the temp & tint as well, although it would be easier with it to correct such a color cast.

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