Image processing method and device and storage medium

The invention provides an image processing method and device, and a storage medium. The method comprises the steps of extracting a red-green-blue channel image and a white channel image from a target image; determining a first gray component image of the red-green-blue channel image, and determining a second gray component image of the white channel image; determining first decomposed sub-band information of the first gray component image, and determining second decomposed sub-band information of the second gray component image; determining third decomposed sub-band information according to the first decomposed sub-band information and the second decomposed sub-band information; and performing image reconstruction according to the third decomposed sub-band information to obtain a third gray component image, and constructing a color image corresponding to the target image according to the third gray component image. In the disclosure, the RGB channel image is compensated by using the information of the W chann