Image processing method and device

The invention relates to an image processing method and an image processing device, which are used for avoiding a hypercolor gamut problem when the saturation of an image is adjusted. The method comprises the following steps: when an input value of a received saturation adjustment proportionality coefficient is greater than 1, determining a corresponding saturation upper limit value according to first color information of a pixel point in a to-be-processed image; a saturation adjustment control curve is determined according to the saturation upper limit value and the input value of the saturation adjustment proportionality coefficient, the saturation adjustment control curve is used for representing the relation between the saturation value and the value of the saturation adjustment proportionality coefficient, and the saturation upper limit value is the maximum value of the saturation on the saturation adjustment control curve; determining a first target value of a saturation adjustment proportionality coeff