1. An imaging system comprising: a color correction circuit configured to perform color shading correction of an image independent of lens shading correction of the image, the color shading correction of the image being based on estimated color consistency models for red and blue color channels of the image; wherein the estimated color consistency model for the red color channel includes a common profile for the red color channel and a scaling factor for the red color channel, the estimated color consistency model for the blue color channel includes a common profile for the blue color channel and a scaling factor for the blue color channel, and the scaling factors for the red and blue color channels correspond to an estimated color temperature for the image.