The embodiment of the invention provides an image processing method, an image processing device and a liquid crystal display (LCD), belonging to the image processing field. The method comprises: obtaining the backlight value of each backlight subarea according to the gray scale luminance value of a display image; and according to the weighted mean comparison result between the backlight value of a target backlight subarea and the backlight values of other backlight subareas, compensating for the sub-pixel display values in a corresponding display subarea of the target backlight subarea. The display image gray scale luminance difference in each display subarea leads to backlight luminance difference, and the backlight luminance difference causes local color cast in the display subarea; through determining the backlight luminance difference and color cast regularity, the sub-pixel display values in the display image are compensated to reduce color cast.