Image brightness adjustment method and device, storage medium and program product

The invention provides an image brightness adjustment method and device, a storage medium and a program product, and belongs to the technical field of image processing. The image brightness adjusting method comprises the steps that a first input image and a second input image are acquired, the first input image is an original image of a target image, and the second input image is a high dynamic range image obtained based on the target image; determining a first gradient direction of each pixel point of the first input image, and determining a second gradient direction of each pixel point of the second input image; based on the difference between the first gradient direction and the second gradient direction of each pixel point, determining a target area of the second input image needing brightness adjustment; and adjusting the brightness of the target area based on the brightness of pixel points in an area corresponding to the target area in the first input image to obtain a result image. According to the inv