characteristics in the firework image sensing mode are provided the setting to increase the chromaticity may be changed according to each gamma characteristic since the output according to the gamma characteristic in the firework image sensing mode is higher than that according to the normal gamma characteristic in a high input level range while the first embodiment of the present invention has been described with respect to an arrangement in which a diaphragm is used as a shutter a different arrangement may be used in which for example a shutter is provided separately from a diaphragm or an electronic shutter implemented by controlling reset and accumulation of electric charge generated by photoelectric conversion in the image sensing unit 103 furthermore the first embodiment is effective both in still image sensing and in moving image sensing and different gamma characteristics respectively associated with still image sensing and moving image sensing may be used fig9 is a block diagram of an image sensing system of a moving image sensing electronic camera schematically showing the second embodiment of the present invention in fig9 reference numeral 201 denotes a lens reference numeral 202 a diaphragm for adjustment of exposure reference numeral 203 an image sensing unit reference numeral 204 an analog front end afe that samples an output from the image sensing unit and performs a d conversion of the sampled output reference numeral 205 a y c separation circuit reference numeral 206 a color signal processing section reference numeral 207 a luminance signal processing section reference numeral 208 a color difference matrix circuit reference numeral 209 a mode switch section reference numeral 210 an addition proportion control section reference numeral 211 a.