Some images contain color casts (imbalanced colors), which may occur during scanning or which may have existed in the original image, particularly older photographs. You’ll find that some of your images look very cold – they have a blue cast, or often photographs taken indoors will look too warm – they have a yellow cast. You can remove a colour cast very quickly in Photoshop.
1. Open an image with an obvious colour cast.
2. Choose Image > Adjustments > Auto Color