An image sensor includes a light sensing array, a light filtering array, and a plurality of conversion units. The light sensing array includes a plurality of light sensing units. Each of the light sensing units includes a plurality of light sensing pixels. The light filtering array is disposed on the light sensing array. The light filtering array further includes a plurality of light filtering units. Each of the light filtering units correspondingly covers one of the light sensing units. Each of the conversion units includes at least two source followers. At least one of the at least two source followers is connected to a plurality of the light sensing pixels. A control method configured to control the image sensor and an electronic device including the image sensor are also provided.