An image processing method and apparatus, and an electronic device are provided. The image processing method is applied in an electronic device. The electronic device includes an image sensor. The image sensor includes an array of photosensitive pixel units and an array of filter units arranged on the array of photosensitive pixel units, each filter unit corresponds to one photosensitive pixel unit, and each photosensitive pixel unit includes a plurality of photosensitive pixels. The image processing method includes outputting a merged image by the image sensor; determining a focusing area of the merged image; determining whether there is a target object in the focusing area; and when there is the target object in the focusing area, converting the merged image into a merged true-color image.