The invention discloses an image processing method, an image processing device, a terminal and a computer readable storage medium. The method comprises the following steps: acquiring an ambient brightness value when a target image is acquired through a camera; judging whether a first brightness value of a target area in the target image exceeds a preset brightness interval or not; and if the first brightness value of the target area exceeds the preset brightness interval, adjusting the brightness value of the target area according to the ambient brightness value. According to the image processing method provided by the embodiment of the invention, firstly when the target image is acquired through the camera, the ambient brightness value is acquired through a light sensor; then, whether the first brightness value of the target area in the target image exceeds the preset brightness interval or not is judged; and when the first brightness value of the target area exceeds the preset brightness interval, the brightness value of the target area is adjusted according to the ambient brightness value, so that the accuracy of brightness control for a photograph is improved, and brightness distortion of the photograph is avoided.