Neutralizing an undesirable color cast using a filter
Under image
adjustments, open the photo filter
Menu: Image -> Adjustments -> Photo filter
or
If you want to do this non-destructively, then create an adjustment
layer instead.
Menu: Layer -> New Adjustment Layer -> Photo filter
In the photo filter dialog box select the Color
swatch and click on the color box. This will bring up the color swatch.
Then using the color picker of the area of the photo you wish to
conteract.
Add 180 degrees to the hue (‘H’) modulo 360 to
select a photo filter that will neutralize the selected color.
Use the density slider to select the strength of
the filter.