Select the subjects with the magnetic lasso tool. Magnify and clean up selection by adding-subtracting as needed. Feather the selection somewhere from 2-8 pixels depending on resolution of original. Save selection as "subject". Invert the selection.
Create new layer from background. Selection will still be loaded. Choose gradient tool. Default gradient will be based on the foreground/background colors set in your toolbox. Change those to roughly what you want first. Double-click on the gradient in upper left of toolbar and load/adjust gradient/colors and type (radial, angled, straight, whatever ΓΆ€” There are a huge variey of preset gradients from which to choose) to your satisfaction.
Move the cursor to the top of your imnage and draw the gradient straight down. It will apply only to the selected (background) area.
Go to layers, create a new adjustment layer for hue/saturation (your selection must still be active when you do this; relaod it if it is not.) and adjust hue, saturation, and lightness of the background to your taste.
It sounds a lot more complicated than it is. The only hard part is the selection. If you have another, favorite method to select, use that; I'm used to working with the lassoes, but there are other ways. The application/adjustment of the gradient takes only seconds. I do this allt he time with books, which we sell; shoot them against a chromakey background, select out the background, and load a gradient.
Robt.
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