I have several photos of similar subjects on the same background.
As they were taken outside at different times, the lighting conditions are different, and so the colours in the photos aren't equivalent. For example, in some photos the grass is much bluer than in others, even though it's the same grass.
I'd like to be able to pick a colour or area of the photos, and say 'This should be the same colour', and have the photos adjusted accordingly. Hopefully, then, the colours of the subjects will be more comparable.
Is this possible? Will it work? What Windows or Linux software (preferably not Photoshop, please!) will do it?