An image processing method and apparatus, and an electronic device are provided. The image sensor is controlled to output the compositing image. The merged image and the color-block image can be output respectively under different scenes requiring different imaging effect. Then the preset target region is identified in the merged image. Finally, the processed merged image (i.e. the merged true-color image) corresponding to the preset target region is composited with the processed color-block image (i.e. the simulation true-color image). Therefore, the signal-to-noise ratio, the resolution and distinguishability are improved. The placed location in the simulation true-color image can be manually adjusted, thereby enhancing user experience.