An image processing method is provided. The image sensor is controlled to output the merged image. It is determined whether there is a target object in the merged image. When there is the target object in the merged image, the merged image is converted into a merged true-color image. An image processing apparatus and an electronic device are provided. With the image processing method, the image processing apparatus and the electronic device, by determining whether there is a target object in the merged image, the image sensor is controlled to output a suitable image. The situation that the image sensor needs to take a long work to output a high quality image can be avoided, such that the work time is reduced, the work efficiency is improved, thus improving the user satisfaction.