Image processing method and device and photographing method and device

The invention relates to an image processing method and device and a photographing method and device. The image processing method comprises the following steps: determining pixel value probability distribution of an image based on each pixel value of the image; determining a pixel value stretching parameter according to the pixel value probability distribution; calculating a scaling ratio of each pixel value of the image based on the pixel value stretching parameter; and respectively adjusting each pixel value of the image based on the scaling of each pixel value. According to the image processing method and device disclosed by the invention, the picture light can be automatically adjusted, and the method and device have adaptivity and wide application; complexity is low, implementation is easy, and the method can be applied to a real-time photographing scene of a camera; and original color information is kept on the basis of adjusting the brightness of the photo. 本公开关于一种图像处理方法及装置、以及一种拍照方法及装置。该图像处理方法包括：基于图像的各