A method for image or video shooting, applied to an electronic device comprising a first camera and a second camera, wherein the method for image or video shooting comprises: displaying, by the electronic device, a first screen, wherein the first screen comprises a preview image, a first widget, and a second widget, and the second widget indicates a photo mode; detecting a first operation on the first widget; determining, by the electronic device, a first zoom ratio in response to the first operation, wherein the preview image is an image captured by the first camera in real time; detecting a second operation on the first screen; capturing, by the electronic device in response to the second operation, images by using the first camera and the second camera based on the first zoom ratio and first lightness, wherein the second camera is an auxiliary camera, the first camera captures one or more frames of images, and the second camera captures one or more frames of images; processing the one or more frames of images captured by the first camera and the one or more frames of images captured by the second camera, to obtain a shot image through fusion; and saving the shot image, wherein the first lightness is a lightness value determined by the electronic device based on the preview image; wherein the electronic device further comprises a third camera, and the method further comprises: detecting a third operation on the first widget; determining, by the electronic device, a second zoom ratio in response to the third operation, and adjusting the preview image to be an image captured by the third camera in real time; detecting a fourth operation on the first screen; capturing, by the electronic device in response to the fourth operation, images by using the first camera and the third camera based on the second zoom ratio and the first lightness, and determining that the first camera is an auxiliary camera, wherein the third camera is different from the second camera, and the third camera captures one or more frames of images; processing the one or more frames of images captured by the first camera and the one or more frames of images captured by the third camera, to obtain a second shot image through fusion; and saving the second shot image. displaying, by the electronic device, a first screen, wherein the first screen comprises a preview image, a first widget, and a second widget, and the second widget indicates a photo mode; detecting a first operation on the first widget; determining, by the electronic device, a first zoom ratio in response to the first operation, wherein the preview image is an image captured by the first camera in real time; detecting a second operation on the first screen; capturing, by the electronic device in response to the second operation, images by using the first camera and the second camera based on the first zoom ratio and first lightness, wherein the second camera is an auxiliary camera, the first camera captures one or more frames of images, and the second camera captures one or more frames of images; processing the one or more frames of images captured by the first camera and the one or more frames of images captured by the second camera, to obtain a shot image through fusion; and saving the shot image, wherein the first lightness is a lightness value determined by the electronic device based on the preview image; wherein the electronic device further comprises a third camera, and the method further comprises: detecting a third operation on the first widget; determining, by the electronic device, a second zoom ratio in response to the third operation, and adjusting the preview image to be an image captured by the third camera in real time; detecting a fourth operation on the first screen; capturing, by the electronic device in response to the fourth operation, images by using the first camera and the third camera based on the second zoom ratio and the first lightness, and determining that the first camera is an auxiliary camera, wherein the third camera is different from the second camera, and the third camera captures one or more frames of images; processing the one or more frames of images captured by the first camera and the one or more frames of images captured by the third camera, to obtain a second shot image through fusion; and saving the second shot image. detecting a third operation on the first widget; determining, by the electronic device, a second zoom ratio in response to the third operation, and adjusting the preview image to be an image captured by the third camera in real time; detecting a fourth operation on the first screen; capturing, by the electronic device in response to the fourth operation, images by using the first camera and the third camera based on the second zoom ratio and the first lightness, and determining that the first camera is an auxiliary camera, wherein the third camera is different from the second camera, and the third camera captures one or more frames of images; processing the one or more frames of images captured by the first camera and the one or more frames of images captured by the third camera, to obtain a second shot image through fusion; and saving the second shot image.